diff --git a/common/json_tok.c b/common/json_tok.c
index e0e3c83b4..17d094032 100644
--- a/common/json_tok.c
+++ b/common/json_tok.c
@@ -2,6 +2,7 @@
 #include <bitcoin/base58.h>
 #include <bitcoin/chainparams.h>
 #include <bitcoin/feerate.h>
+#include <bitcoin/psbt.h>
 #include <bitcoin/script.h>
 #include <ccan/crypto/sha256/sha256.h>
 #include <ccan/json_escape/json_escape.h>
@@ -499,3 +500,17 @@ struct command_result *param_bitcoin_address(struct command *cmd,
 	}
 	abort();
 }
+
+struct command_result *param_psbt(struct command *cmd,
+				  const char *name,
+				  const char *buffer,
+				  const jsmntok_t *tok,
+				  struct wally_psbt **psbt)
+{
+	*psbt = psbt_from_b64(cmd, buffer + tok->start, tok->end - tok->start);
+	if (*psbt)
+		return NULL;
+
+	return command_fail_badparam(cmd, name, buffer, tok,
+				     "Expected a PSBT");
+}
diff --git a/common/json_tok.h b/common/json_tok.h
index e814dc615..1b918ccd1 100644
--- a/common/json_tok.h
+++ b/common/json_tok.h
@@ -16,6 +16,7 @@ struct command;
 struct command_result;
 struct json_escape;
 struct sha256;
+struct wally_psbt;
 
 /* Extract json array token */
 struct command_result *param_array(struct command *cmd, const char *name,
@@ -165,4 +166,10 @@ struct command_result *param_bitcoin_address(struct command *cmd,
 					     const char *buffer,
 					     const jsmntok_t *tok,
 					     const u8 **scriptpubkey);
+
+struct command_result *param_psbt(struct command *cmd,
+				  const char *name,
+				  const char *buffer,
+				  const jsmntok_t *tok,
+				  struct wally_psbt **psbt);
 #endif /* LIGHTNING_COMMON_JSON_TOK_H */
diff --git a/tests/test_wallet.py b/tests/test_wallet.py
index 6e0b3be91..9ff295ee5 100644
--- a/tests/test_wallet.py
+++ b/tests/test_wallet.py
@@ -789,14 +789,14 @@ def test_sign_and_send_psbt(node_factory, bitcoind, chainparams):
         bitcoind.rpc.sendrawtransaction(broadcast_tx['tx'])
 
     # Try an empty PSBT
-    with pytest.raises(RpcError, match=r"should be a PSBT, not"):
+    with pytest.raises(RpcError, match=r"psbt: Expected a PSBT: invalid token"):
         l1.rpc.signpsbt('')
-    with pytest.raises(RpcError, match=r"should be a PSBT, not"):
+    with pytest.raises(RpcError, match=r"psbt: Expected a PSBT: invalid token"):
         l1.rpc.sendpsbt('')
 
     # Try an invalid PSBT string
     invalid_psbt = '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'
-    with pytest.raises(RpcError, match=r"should be a PSBT, not"):
+    with pytest.raises(RpcError, match=r"psbt: Expected a PSBT: invalid token"):
         l1.rpc.signpsbt(invalid_psbt)
 
     wallet_coin_mvts = [
diff --git a/wallet/walletrpc.c b/wallet/walletrpc.c
index 07b239972..3d069ff54 100644
--- a/wallet/walletrpc.c
+++ b/wallet/walletrpc.c
@@ -594,22 +594,6 @@ static const struct json_command listtransactions_command = {
 };
 AUTODATA(json_command, &listtransactions_command);
 
-struct command_result *param_psbt(struct command *cmd,
-				  const char *name,
-				  const char *buffer,
-				  const jsmntok_t *tok,
-				  struct wally_psbt **psbt)
-{
-	*psbt = psbt_from_b64(cmd, buffer + tok->start, tok->end - tok->start);
-	if (*psbt)
-		return NULL;
-
-	return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
-			    "'%s' should be a PSBT, not '%.*s'",
-			    name, json_tok_full_len(tok),
-			    json_tok_full(buffer, tok));
-}
-
 static bool in_only_inputs(const u32 *only_inputs, u32 this)
 {
 	for (size_t i = 0; i < tal_count(only_inputs); i++)
diff --git a/wallet/walletrpc.h b/wallet/walletrpc.h
index c7f8e16af..25af4a0a5 100644
--- a/wallet/walletrpc.h
+++ b/wallet/walletrpc.h
@@ -6,7 +6,6 @@
 struct command;
 struct json_stream;
 struct utxo;
-struct wally_psbt;
 
 void json_add_utxos(struct json_stream *response,
 		    struct wallet *wallet,
@@ -15,9 +14,4 @@ void json_add_utxos(struct json_stream *response,
 /* We evaluate reserved timeouts lazily, so use this. */
 bool is_reserved(const struct utxo *utxo, u32 current_height);
 
-struct command_result *param_psbt(struct command *cmd,
-				  const char *name,
-				  const char *buffer,
-				  const jsmntok_t *tok,
-				  struct wally_psbt **psbt);
 #endif /* LIGHTNING_WALLET_WALLETRPC_H */