diff --git a/bitcoin/signature.c b/bitcoin/signature.c
index 257ff1589..df64d769c 100644
--- a/bitcoin/signature.c
+++ b/bitcoin/signature.c
@@ -4,6 +4,7 @@
 #include "shadouble.h"
 #include "signature.h"
 #include "tx.h"
+#include "type_to_string.h"
 #include "utils.h"
 #include <assert.h>
 #include <ccan/cast/cast.h>
@@ -254,3 +255,13 @@ bool sig_valid(const secp256k1_ecdsa_signature *sig)
 		return true;
 	return false;
 }
+
+static char *signature_to_hexstr(const tal_t *ctx,
+				 const secp256k1_ecdsa_signature *sig)
+{
+	u8 der[72];
+	size_t len = signature_to_der(der, sig);
+
+	return tal_hexstr(ctx, der, len);
+}
+REGISTER_TYPE_TO_STRING(secp256k1_ecdsa_signature, signature_to_hexstr);
diff --git a/type_to_string.h b/type_to_string.h
index 83b30a735..a774161da 100644
--- a/type_to_string.h
+++ b/type_to_string.h
@@ -21,6 +21,7 @@ union printable_types {
 	const secp256k1_pubkey *secp256k1_pubkey;
 	const struct channel_id *channel_id;
 	const struct privkey *privkey;
+	const secp256k1_ecdsa_signature *secp256k1_ecdsa_signature;
 	const char *charp_;
 };