diff --git a/hsmd/Makefile b/hsmd/Makefile
index 4f3fd7d22..4ac793650 100644
--- a/hsmd/Makefile
+++ b/hsmd/Makefile
@@ -29,6 +29,7 @@ HSMD_COMMON_OBJS :=				\
 	common/daemon_conn.o			\
 	common/debug.o				\
 	common/funding_tx.o			\
+	common/io_debug.o			\
 	common/key_derive.o			\
 	common/msg_queue.o			\
 	common/permute_tx.o			\
diff --git a/hsmd/hsm.c b/hsmd/hsm.c
index f0503c2be..3f72c7ef0 100644
--- a/hsmd/hsm.c
+++ b/hsmd/hsm.c
@@ -16,6 +16,7 @@
 #include <common/daemon_conn.h>
 #include <common/debug.h>
 #include <common/funding_tx.h>
+#include <common/io_debug.h>
 #include <common/status.h>
 #include <common/utils.h>
 #include <common/version.h>
@@ -662,6 +663,7 @@ int main(int argc, char *argv[])
 	}
 
 	subdaemon_debug(argc, argv);
+	io_poll_override(debug_poll);
 
 	secp256k1_ctx = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY
 						 | SECP256K1_CONTEXT_SIGN);