diff --git a/common/json_parse.c b/common/json_parse.c
index dc89a41a5..0791ce2e1 100644
--- a/common/json_parse.c
+++ b/common/json_parse.c
@@ -23,30 +23,6 @@
 #include <stdio.h>
 #include <wire/onion_wire.h>
 
-bool json_to_s64(const char *buffer, const jsmntok_t *tok, s64 *num)
-{
-	char *end;
-	long long l;
-
-	l = strtoll(buffer + tok->start, &end, 0);
-	if (end != buffer + tok->end)
-		return false;
-
-	BUILD_ASSERT(sizeof(l) >= sizeof(*num));
-	*num = l;
-
-	/* Check for overflow/underflow */
-	if ((l == LONG_MAX || l == LONG_MIN) && errno == ERANGE)
-		return false;
-
-	/* Check if the number did not fit in `s64` (in case `long long`
-	is a bigger type). */
-	if (*num != l)
-		return false;
-
-	return true;
-}
-
 bool json_to_millionths(const char *buffer, const jsmntok_t *tok,
 			u64 *millionths)
 {
diff --git a/common/json_parse_simple.c b/common/json_parse_simple.c
index 0ccbd9573..7f9c630eb 100644
--- a/common/json_parse_simple.c
+++ b/common/json_parse_simple.c
@@ -88,6 +88,30 @@ bool json_to_u64(const char *buffer, const jsmntok_t *tok, u64 *num)
 	return true;
 }
 
+bool json_to_s64(const char *buffer, const jsmntok_t *tok, s64 *num)
+{
+	char *end;
+	long long l;
+
+	l = strtoll(buffer + tok->start, &end, 0);
+	if (end != buffer + tok->end)
+		return false;
+
+	BUILD_ASSERT(sizeof(l) >= sizeof(*num));
+	*num = l;
+
+	/* Check for overflow/underflow */
+	if ((l == LONG_MAX || l == LONG_MIN) && errno == ERANGE)
+		return false;
+
+	/* Check if the number did not fit in `s64` (in case `long long`
+	is a bigger type). */
+	if (*num != l)
+		return false;
+
+	return true;
+}
+
 bool json_str_to_u64(const char *buffer, const jsmntok_t *tok, u64 *num)
 {
 	jsmntok_t temp;
diff --git a/common/json_parse_simple.h b/common/json_parse_simple.h
index 2c7c3c897..710520d6f 100644
--- a/common/json_parse_simple.h
+++ b/common/json_parse_simple.h
@@ -35,6 +35,9 @@ char *json_strdup(const tal_t *ctx, const char *buffer, const jsmntok_t *tok);
 /* Extract number from this (may be a string, or a number literal) */
 bool json_to_u64(const char *buffer, const jsmntok_t *tok, u64 *num);
 
+/* Extract signed 64 bit integer from this (may be a string, or a number literal) */
+bool json_to_s64(const char *buffer, const jsmntok_t *tok, s64 *num);
+
 /* Extract number from string. The number must be the entirety of the
  * string between the '"' */
 bool json_str_to_u64(const char *buffer, const jsmntok_t *tok, u64 *num);
diff --git a/common/test/run-bolt12_merkle-json.c b/common/test/run-bolt12_merkle-json.c
index 95fcc507a..bcfc9ee6b 100644
--- a/common/test/run-bolt12_merkle-json.c
+++ b/common/test/run-bolt12_merkle-json.c
@@ -45,6 +45,9 @@ void towire_channel_id(u8 **pptr UNNEEDED, const struct channel_id *channel_id U
 /* Generated stub for towire_node_id */
 void towire_node_id(u8 **pptr UNNEEDED, const struct node_id *id UNNEEDED)
 { fprintf(stderr, "towire_node_id called!\n"); abort(); }
+/* Generated stub for towire_s64 */
+void towire_s64(u8 **pptr UNNEEDED, s64 v UNNEEDED)
+{ fprintf(stderr, "towire_s64 called!\n"); abort(); }
 /* Generated stub for towire_secp256k1_ecdsa_signature */
 void towire_secp256k1_ecdsa_signature(u8 **pptr UNNEEDED,
 			      const secp256k1_ecdsa_signature *signature UNNEEDED)
diff --git a/contrib/msggen/msggen/gen/grpc.py b/contrib/msggen/msggen/gen/grpc.py
index e76f8c8ec..3b6918909 100644
--- a/contrib/msggen/msggen/gen/grpc.py
+++ b/contrib/msggen/msggen/gen/grpc.py
@@ -22,6 +22,10 @@ typemap = {
     'u8': 'uint32',  # Yep, this is the smallest integer type in grpc...
     'u32': 'uint32',
     'u64': 'uint64',
+    's8': 'int32',
+    's16': 'int32',
+    's32': 'int32',
+    's64': 'int64',
     'u16': 'uint32',  # Yeah, I know...
     'f32': 'float',
     'integer': 'sint64',
diff --git a/contrib/msggen/msggen/gen/grpc2py.py b/contrib/msggen/msggen/gen/grpc2py.py
index 503eff162..9cf03c609 100644
--- a/contrib/msggen/msggen/gen/grpc2py.py
+++ b/contrib/msggen/msggen/gen/grpc2py.py
@@ -40,6 +40,10 @@ class Grpc2PyGenerator(IGenerator):
             'u16': "m.{name}",
             'u32': "m.{name}",
             'u64': "m.{name}",
+            's8': "m.{name}",
+            's16': "m.{name}",
+            's32': "m.{name}",
+            's64': "m.{name}",
             'boolean': "m.{name}",
             'short_channel_id': "m.{name}",
             'msat': "amount2msat(m.{name})",
diff --git a/contrib/pyln-proto/pyln/proto/message/__init__.py b/contrib/pyln-proto/pyln/proto/message/__init__.py
index 40d2d6b24..c153e28aa 100644
--- a/contrib/pyln-proto/pyln/proto/message/__init__.py
+++ b/contrib/pyln-proto/pyln/proto/message/__init__.py
@@ -22,6 +22,10 @@ __all__ = [
     'u16',
     'u32',
     'u64',
+    's8',
+    's16',
+    's32',
+    's64',
     'tu16',
     'tu32',
     'tu64',
diff --git a/contrib/pyln-proto/pyln/proto/message/fundamental_types.py b/contrib/pyln-proto/pyln/proto/message/fundamental_types.py
index 75aa4d640..36ef31749 100644
--- a/contrib/pyln-proto/pyln/proto/message/fundamental_types.py
+++ b/contrib/pyln-proto/pyln/proto/message/fundamental_types.py
@@ -257,6 +257,10 @@ def fundamental_types() -> List[FieldType]:
     # * `u16`: a 2 byte unsigned integer
     # * `u32`: a 4 byte unsigned integer
     # * `u64`: an 8 byte unsigned integer
+    # * `s8`: an 8-bit signed integer
+    # * `s16`: a 2 byte signed integer
+    # * `s32`: a 4 byte signed integer
+    # * `s64`: an 8 byte signed integer
     #
     # Inside TLV records which contain a single value, leading zeros in
     # integers can be omitted:
@@ -284,6 +288,10 @@ def fundamental_types() -> List[FieldType]:
             IntegerType('u16', 2, '>H'),
             IntegerType('u32', 4, '>I'),
             IntegerType('u64', 8, '>Q'),
+            IntegerType('s8', 1, 'b'),
+            IntegerType('s16', 2, '>h'),
+            IntegerType('s32', 4, '>i'),
+            IntegerType('s64', 8, '>q'),
             TruncatedIntType('tu16', 2),
             TruncatedIntType('tu32', 4),
             TruncatedIntType('tu64', 8),
diff --git a/contrib/pyln-proto/tests/test_fundamental_types.py b/contrib/pyln-proto/tests/test_fundamental_types.py
index 1c22f3a21..8da878cb5 100644
--- a/contrib/pyln-proto/tests/test_fundamental_types.py
+++ b/contrib/pyln-proto/tests/test_fundamental_types.py
@@ -13,6 +13,29 @@ def test_fundamental_types():
               'u64': [['18446744073709551615',
                        b'\xff\xff\xff\xff\xff\xff\xff\xff'],
                       ['0', b'\x00\x00\x00\x00\x00\x00\x00\x00']],
+              's8': [['0', b'\x00'],
+                     ['42', b'\x2a'],
+                     ['-42', b'\xd6'],
+                     ['127', b'\x7f'],
+                     ['-128', b'\x80']],
+              's16': [['128', b'\x00\x80'],
+                      ['-129', b'\xff\x7f'],
+                      ['15000', b'\x3a\x98'],
+                      ['-15000', b'\xc5\x68'],
+                      ['32767', b'\x7f\xff'],
+                      ['-32768', b'\x80\x00']],
+              's32': [['32768', b'\x00\x00\x80\x00'],
+                      ['-32769', b'\xff\xff\x7f\xff'],
+                      ['21000000', b'\x01\x40\x6f\x40'],
+                      ['-21000000', b'\xfe\xbf\x90\xc0'],
+                      ['2147483647', b'\x7f\xff\xff\xff'],
+                      ['-2147483648', b'\x80\x00\x00\x00']],
+              's64': [['2147483648', b'\x00\x00\x00\x00\x80\x00\x00\x00'],
+                      ['-2147483649', b'\xff\xff\xff\xff\x7f\xff\xff\xff'],
+                      ['500000000000', b'\x00\x00\x00\x74\x6a\x52\x88\x00'],
+                      ['-500000000000', b'\xff\xff\xff\x8b\x95\xad\x78\x00'],
+                      ['9223372036854775807', b'\x7f\xff\xff\xff\xff\xff\xff\xff'],
+                      ['-9223372036854775808', b'\x80\x00\x00\x00\x00\x00\x00\x00']],
               'tu16': [['65535', b'\xff\xff'],
                        ['256', b'\x01\x00'],
                        ['255', b'\xff'],
diff --git a/devtools/Makefile b/devtools/Makefile
index 50150ab6c..dc1a22b24 100644
--- a/devtools/Makefile
+++ b/devtools/Makefile
@@ -8,7 +8,7 @@ DEVTOOLS_TOOL_OBJS := $(DEVTOOLS_TOOL_SRC:.c=.o)
 
 # Make sure these depend on everything.
 ALL_C_SOURCES += $(DEVTOOLS_TOOL_SRC)
-ALL_C_HEADERS += 
+ALL_C_HEADERS +=
 ALL_PROGRAMS += $(DEVTOOLS)
 
 DEVTOOLS_COMMON_OBJS :=				\
diff --git a/devtools/print_wire.c b/devtools/print_wire.c
index 9b1792f15..a87eeedc7 100644
--- a/devtools/print_wire.c
+++ b/devtools/print_wire.c
@@ -51,6 +51,50 @@ bool printwire_u64(const char *fieldname, const u8 **cursor, size_t *plen)
 	return true;
 }
 
+bool printwire_s8(const char *fieldname, const u8 **cursor, size_t *plen)
+{
+	s8 v = fromwire_s8(cursor, plen);
+	if (!*cursor) {
+		printf("**TRUNCATED s64 %s**\n", fieldname);
+		return false;
+	}
+	printf("%d\n", v);
+	return true;
+}
+
+bool printwire_s16(const char *fieldname, const u8 **cursor, size_t *plen)
+{
+	s16 v = fromwire_s16(cursor, plen);
+	if (!*cursor) {
+		printf("**TRUNCATED s64 %s**\n", fieldname);
+		return false;
+	}
+	printf("%d\n", v);
+	return true;
+}
+
+bool printwire_s32(const char *fieldname, const u8 **cursor, size_t *plen)
+{
+	s32 v = fromwire_s32(cursor, plen);
+	if (!*cursor) {
+		printf("**TRUNCATED s64 %s**\n", fieldname);
+		return false;
+	}
+	printf("%d\n", v);
+	return true;
+}
+
+bool printwire_s64(const char *fieldname, const u8 **cursor, size_t *plen)
+{
+	s64 v = fromwire_s64(cursor, plen);
+	if (!*cursor) {
+		printf("**TRUNCATED s64 %s**\n", fieldname);
+		return false;
+	}
+	printf("%ld\n", v);
+	return true;
+}
+
 bool printwire_tu16(const char *fieldname, const u8 **cursor, size_t *plen)
 {
 	u16 v = fromwire_tu16(cursor, plen);
diff --git a/devtools/print_wire.h b/devtools/print_wire.h
index 74607d1a5..96ae674f7 100644
--- a/devtools/print_wire.h
+++ b/devtools/print_wire.h
@@ -20,6 +20,10 @@ bool printwire_u8(const char *fieldname, const u8 **cursor, size_t *plen);
 bool printwire_u16(const char *fieldname, const u8 **cursor, size_t *plen);
 bool printwire_u32(const char *fieldname, const u8 **cursor, size_t *plen);
 bool printwire_u64(const char *fieldname, const u8 **cursor, size_t *plen);
+bool printwire_s8(const char *fieldname, const u8 **cursor, size_t *plen);
+bool printwire_s16(const char *fieldname, const u8 **cursor, size_t *plen);
+bool printwire_s32(const char *fieldname, const u8 **cursor, size_t *plen);
+bool printwire_s64(const char *fieldname, const u8 **cursor, size_t *plen);
 bool printwire_tu16(const char *fieldname, const u8 **cursor, size_t *plen);
 bool printwire_tu32(const char *fieldname, const u8 **cursor, size_t *plen);
 bool printwire_tu64(const char *fieldname, const u8 **cursor, size_t *plen);
diff --git a/tools/generate-wire.py b/tools/generate-wire.py
index a174985aa..612ad4b5c 100755
--- a/tools/generate-wire.py
+++ b/tools/generate-wire.py
@@ -184,6 +184,10 @@ class Type(FieldSet):
         'u16',
         'u32',
         'u64',
+        's8',
+        's16',
+        's32',
+        's64',
         'tu16',
         'tu32',
         'tu64',
@@ -199,6 +203,10 @@ class Type(FieldSet):
         'u16',
         'u32',
         'u64',
+        's8',
+        's16',
+        's32',
+        's64',
         'bool',
         'secp256k1_ecdsa_signature',
         'secp256k1_ecdsa_recoverable_signature',
diff --git a/tools/test/Makefile b/tools/test/Makefile
index e067590dc..dac2a2906 100644
--- a/tools/test/Makefile
+++ b/tools/test/Makefile
@@ -28,7 +28,9 @@ ALL_C_SOURCES += $(TOOL_GEN_SRC) $(TOOL_TEST_SRC)
 ALL_C_HEADERS += $(TOOL_GEN_HEADER)
 
 TOOL_TEST_COMMON_OBJS :=		\
-	common/utils.o
+	common/utils.o			\
+	wire/fromwire.o			\
+	wire/towire.o
 
 TOOLS_WIRE_DEPS := $(BOLT_DEPS) tools/test/test_cases $(wildcard tools/gen/*_template)
 
diff --git a/tools/test/run-test-wire.c b/tools/test/run-test-wire.c
index a165cd65c..7e3365e8e 100644
--- a/tools/test/run-test-wire.c
+++ b/tools/test/run-test-wire.c
@@ -3,49 +3,37 @@
 #include "print_gen.h"
 
 #include <assert.h>
+#include <ccan/array_size/array_size.h>
+#include <ccan/mem/mem.h>
 #include <stdio.h>
+#include <wire/wire.h>
 
 
 /* AUTOGENERATED MOCKS START */
 /* Generated stub for fromwire_amount_msat */
 struct amount_msat fromwire_amount_msat(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_amount_msat called!\n"); abort(); }
-/* Generated stub for fromwire_bool */
-bool fromwire_bool(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
-{ fprintf(stderr, "fromwire_bool called!\n"); abort(); }
-/* Generated stub for fromwire_peektype */
-int fromwire_peektype(const u8 *cursor UNNEEDED)
-{ fprintf(stderr, "fromwire_peektype called!\n"); abort(); }
 /* Generated stub for fromwire_tlv */
 bool fromwire_tlv(const u8 **cursor UNNEEDED, size_t *max UNNEEDED,
 		  const struct tlv_record_type *types UNNEEDED, size_t num_types UNNEEDED,
 		  void *record UNNEEDED, struct tlv_field **fields UNNEEDED,
 		  const u64 *extra_types UNNEEDED, size_t *err_off UNNEEDED, u64 *err_type UNNEEDED)
 { fprintf(stderr, "fromwire_tlv called!\n"); abort(); }
-/* Generated stub for fromwire_tu32 */
-u32 fromwire_tu32(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
-{ fprintf(stderr, "fromwire_tu32 called!\n"); abort(); }
-/* Generated stub for fromwire_tu64 */
-u64 fromwire_tu64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
-{ fprintf(stderr, "fromwire_tu64 called!\n"); abort(); }
-/* Generated stub for fromwire_u16 */
-u16 fromwire_u16(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
-{ fprintf(stderr, "fromwire_u16 called!\n"); abort(); }
-/* Generated stub for fromwire_u32 */
-u32 fromwire_u32(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
-{ fprintf(stderr, "fromwire_u32 called!\n"); abort(); }
-/* Generated stub for fromwire_u64 */
-u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
-{ fprintf(stderr, "fromwire_u64 called!\n"); abort(); }
-/* Generated stub for fromwire_u8 */
-u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
-{ fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
-/* Generated stub for fromwire_u8_array */
-void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
-{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for printwire_amount_msat */
 bool printwire_amount_msat(const char *fieldname UNNEEDED, const u8 **cursor UNNEEDED, size_t *plen UNNEEDED)
 { fprintf(stderr, "printwire_amount_msat called!\n"); abort(); }
+/* Generated stub for printwire_s16 */
+bool printwire_s16(const char *fieldname UNNEEDED, const u8 **cursor UNNEEDED, size_t *plen UNNEEDED)
+{ fprintf(stderr, "printwire_s16 called!\n"); abort(); }
+/* Generated stub for printwire_s32 */
+bool printwire_s32(const char *fieldname UNNEEDED, const u8 **cursor UNNEEDED, size_t *plen UNNEEDED)
+{ fprintf(stderr, "printwire_s32 called!\n"); abort(); }
+/* Generated stub for printwire_s64 */
+bool printwire_s64(const char *fieldname UNNEEDED, const u8 **cursor UNNEEDED, size_t *plen UNNEEDED)
+{ fprintf(stderr, "printwire_s64 called!\n"); abort(); }
+/* Generated stub for printwire_s8 */
+bool printwire_s8(const char *fieldname UNNEEDED, const u8 **cursor UNNEEDED, size_t *plen UNNEEDED)
+{ fprintf(stderr, "printwire_s8 called!\n"); abort(); }
 /* Generated stub for printwire_tlvs */
 bool printwire_tlvs(const char *tlv_name UNNEEDED, const u8 **cursor UNNEEDED, size_t *plen UNNEEDED,
 		    const struct tlv_print_record_type types[] UNNEEDED, size_t num_types UNNEEDED)
@@ -71,37 +59,76 @@ bool printwire_u8_array(const char *fieldname UNNEEDED, const u8 **cursor UNNEED
 /* Generated stub for towire_amount_msat */
 void towire_amount_msat(u8 **pptr UNNEEDED, const struct amount_msat msat UNNEEDED)
 { fprintf(stderr, "towire_amount_msat called!\n"); abort(); }
-/* Generated stub for towire_bool */
-void towire_bool(u8 **pptr UNNEEDED, bool v UNNEEDED)
-{ fprintf(stderr, "towire_bool called!\n"); abort(); }
 /* Generated stub for towire_tlv */
 void towire_tlv(u8 **pptr UNNEEDED,
 		const struct tlv_record_type *types UNNEEDED, size_t num_types UNNEEDED,
 		const void *record UNNEEDED)
 { fprintf(stderr, "towire_tlv called!\n"); abort(); }
-/* Generated stub for towire_tu32 */
-void towire_tu32(u8 **pptr UNNEEDED, u32 v UNNEEDED)
-{ fprintf(stderr, "towire_tu32 called!\n"); abort(); }
-/* Generated stub for towire_tu64 */
-void towire_tu64(u8 **pptr UNNEEDED, u64 v UNNEEDED)
-{ fprintf(stderr, "towire_tu64 called!\n"); abort(); }
-/* Generated stub for towire_u16 */
-void towire_u16(u8 **pptr UNNEEDED, u16 v UNNEEDED)
-{ fprintf(stderr, "towire_u16 called!\n"); abort(); }
-/* Generated stub for towire_u32 */
-void towire_u32(u8 **pptr UNNEEDED, u32 v UNNEEDED)
-{ fprintf(stderr, "towire_u32 called!\n"); abort(); }
-/* Generated stub for towire_u64 */
-void towire_u64(u8 **pptr UNNEEDED, u64 v UNNEEDED)
-{ fprintf(stderr, "towire_u64 called!\n"); abort(); }
-/* Generated stub for towire_u8 */
-void towire_u8(u8 **pptr UNNEEDED, u8 v UNNEEDED)
-{ fprintf(stderr, "towire_u8 called!\n"); abort(); }
-/* Generated stub for towire_u8_array */
-void towire_u8_array(u8 **pptr UNNEEDED, const u8 *arr UNNEEDED, size_t num UNNEEDED)
-{ fprintf(stderr, "towire_u8_array called!\n"); abort(); }
 /* AUTOGENERATED MOCKS END */
 
+#define COMPARE_VALS(type, len)					\
+	for (size_t i = 0; i < ARRAY_SIZE(type##s); i++) {	\
+		const u8 *ptr, *data = 				\
+			tal_hexdata(ctx, type##s[i].hexstr,	\
+				    strlen(type##s[i].hexstr)); \
+		size_t max, size = tal_bytelen(data);		\
+		assert(size == (len));				\
+		max = size;					\
+		ptr = data;					\
+		type val = fromwire_##type(&ptr, &max);		\
+		assert(max == 0);				\
+		assert(val == type##s[i].val);			\
+								\
+		/* Check towire */				\
+		u8 *wired = tal_arr(ctx, u8, 0);		\
+		towire_##type(&wired, (type)type##s[i].val);	\
+		assert(memeq(data, size, wired, tal_bytelen(wired)));	\
+	}
+
+static void test_signed_ints(void)
+{
+	/* Let's test some serializations */
+	void *ctx = tal(NULL, char);
+	struct test_case {
+		s64 val;
+		char *hexstr;
+	} s8s[] = {
+		{ .val = 0, .hexstr = "00" },
+		{ .val = 42, .hexstr = "2a" },
+		{ .val = -42, .hexstr = "d6" },
+		{ .val = 127, .hexstr = "7f" },
+		{ .val = -128, .hexstr = "80" },
+	}, s16s[] = {
+		{ .val = 128, .hexstr = "0080" },
+		{ .val = -129, .hexstr = "ff7f" },
+		{ .val = 15000, .hexstr = "3a98" },
+		{ .val = -15000, .hexstr = "c568" },
+		{ .val = 32767, .hexstr = "7fff" },
+		{ .val = -32768, .hexstr = "8000" },
+	}, s32s[] = {
+		{ .val = 32768, .hexstr = "00008000" },
+		{ .val = -32769, .hexstr = "ffff7fff" },
+		{ .val = 21000000, .hexstr = "01406f40" },
+		{ .val = -21000000, .hexstr = "febf90c0" },
+		{ .val = 2147483647, .hexstr = "7fffffff" },
+		{ .val = -2147483648, .hexstr = "80000000" },
+	}, s64s[] = {
+		{ .val = 2147483648, .hexstr = "0000000080000000" },
+		{ .val = -2147483649, .hexstr = "ffffffff7fffffff" },
+		{ .val = 500000000000, .hexstr = "000000746a528800" },
+		{ .val = -500000000000, .hexstr = "ffffff8b95ad7800" },
+		{ .val = 9223372036854775807, .hexstr = "7fffffffffffffff" },
+		{ .val = -9223372036854775808ULL, .hexstr = "8000000000000000" },
+	};
+
+	COMPARE_VALS(s8, 1);
+	COMPARE_VALS(s16, 2);
+	COMPARE_VALS(s32, 4);
+	COMPARE_VALS(s64, 8);
+
+	tal_free(ctx);
+}
+
 int main(void)
 {
 	setup_locale();
@@ -115,5 +142,7 @@ int main(void)
 	assert(n2);
 	assert(n3);
 
+	test_signed_ints();
+
 	tal_free(ctx);
 }
diff --git a/tools/test/test_cases b/tools/test/test_cases
index 6ff99f53a..b479c530e 100644
--- a/tools/test/test_cases
+++ b/tools/test/test_cases
@@ -30,6 +30,11 @@ msgdata,test_msg,test_varsize_struct_varlen,test_features,len_varsize_struct
 msgdata,test_msg,test_assignable,u16,
 # enum
 msgdata,test_msg,test_enum,enum test_enum,
+# test signed int fields
+msgdata,test_msg,test_s8,s8,
+msgdata,test_msg,test_s16,s16,
+msgdata,test_msg,test_s32,s32,
+msgdata,test_msg,test_s64,s64,
 # test struct
 msgdata,test_msg,test_struct,test_short_id,
 # test var-size struct
diff --git a/wire/fromwire.c b/wire/fromwire.c
index 37727f4a7..99a0be755 100644
--- a/wire/fromwire.c
+++ b/wire/fromwire.c
@@ -88,6 +88,26 @@ u64 fromwire_u64(const u8 **cursor, size_t *max)
 	return be64_to_cpu(ret);
 }
 
+s8 fromwire_s8(const u8 **cursor, size_t *max)
+{
+	return (s8)fromwire_u8(cursor, max);
+}
+
+s16 fromwire_s16(const u8 **cursor, size_t *max)
+{
+	return (s16)fromwire_u16(cursor, max);
+}
+
+s32 fromwire_s32(const u8 **cursor, size_t *max)
+{
+	return (s32)fromwire_u32(cursor, max);
+}
+
+s64 fromwire_s64(const u8 **cursor, size_t *max)
+{
+	return (s64)fromwire_u64(cursor, max);
+}
+
 static u64 fromwire_tlv_uint(const u8 **cursor, size_t *max, size_t maxlen)
 {
 	u8 bytes[8];
diff --git a/wire/towire.c b/wire/towire.c
index 49eae1523..c3a9a2139 100644
--- a/wire/towire.c
+++ b/wire/towire.c
@@ -39,6 +39,26 @@ void towire_u64(u8 **pptr, u64 v)
 	towire(pptr, &l, sizeof(l));
 }
 
+void towire_s8(u8 **pptr, s8 v)
+{
+	towire_u8(pptr, (u8)v);
+}
+
+void towire_s32(u8 **pptr, s32 v)
+{
+	towire_u32(pptr, (u32)v);
+}
+
+void towire_s16(u8 **pptr, s16 v)
+{
+	towire_u16(pptr, (u16)v);
+}
+
+void towire_s64(u8 **pptr, s64 v)
+{
+	towire_u64(pptr, (u64)v);
+}
+
 static void towire_tlv_uint(u8 **pptr, u64 v)
 {
 	u8 bytes[8];
diff --git a/wire/wire.h b/wire/wire.h
index e03b11f82..548f5b074 100644
--- a/wire/wire.h
+++ b/wire/wire.h
@@ -31,6 +31,10 @@ void towire_u8(u8 **pptr, u8 v);
 void towire_u16(u8 **pptr, u16 v);
 void towire_u32(u8 **pptr, u32 v);
 void towire_u64(u8 **pptr, u64 v);
+void towire_s8(u8 **pptr, s8 v);
+void towire_s16(u8 **pptr, s16 v);
+void towire_s32(u8 **pptr, s32 v);
+void towire_s64(u8 **pptr, s64 v);
 void towire_tu16(u8 **pptr, u16 v);
 void towire_tu32(u8 **pptr, u32 v);
 void towire_tu64(u8 **pptr, u64 v);
@@ -49,6 +53,10 @@ u8 fromwire_u8(const u8 **cursor, size_t *max);
 u16 fromwire_u16(const u8 **cursor, size_t *max);
 u32 fromwire_u32(const u8 **cursor, size_t *max);
 u64 fromwire_u64(const u8 **cursor, size_t *max);
+s8 fromwire_s8(const u8 **cursor, size_t *max);
+s16 fromwire_s16(const u8 **cursor, size_t *max);
+s32 fromwire_s32(const u8 **cursor, size_t *max);
+s64 fromwire_s64(const u8 **cursor, size_t *max);
 u16 fromwire_tu16(const u8 **cursor, size_t *max);
 u32 fromwire_tu32(const u8 **cursor, size_t *max);
 u64 fromwire_tu64(const u8 **cursor, size_t *max);