diff --git a/devtools/Makefile b/devtools/Makefile
index 1ca419d7de3f..c220ecd23e38 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 += devtools/print_wire.h 
 ALL_PROGRAMS += $(DEVTOOLS)
 
 # Don't include this in ALL_PROGRAMS as we need a special link line for -lz
@@ -90,7 +90,7 @@ devtools/onion: $(DEVTOOLS_COMMON_OBJS) $(JSMN_OBJS) $(BITCOIN_OBJS) common/onio
 
 devtools/gossipwith: $(DEVTOOLS_COMMON_OBJS) $(JSMN_OBJS) $(BITCOIN_OBJS) wire/fromwire.o wire/towire.o wire/peer_wiregen.o devtools/gossipwith.o common/cryptomsg.o common/cryptomsg.o
 
-$(DEVTOOLS_OBJS) $(DEVTOOLS_TOOL_OBJS): wire/wire.h
+$(DEVTOOLS_OBJS) $(DEVTOOLS_TOOL_OBJS): wire/wire.h devtools/print_wire.h 
 
 devtools/mkcommit: $(DEVTOOLS_COMMON_OBJS) $(BITCOIN_OBJS) common/derive_basepoints.o common/channel_type.o common/keyset.o common/key_derive.o common/initial_commit_tx.o common/permute_tx.o wire/fromwire.o wire/towire.o devtools/mkcommit.o channeld/full_channel.o common/initial_channel.o common/htlc_state.o common/pseudorand.o common/htlc_tx.o channeld/commit_tx.o common/htlc_trim.o
 
diff --git a/devtools/print_wire.c b/devtools/print_wire.c
index 15669899dd95..98a559ef5206 100644
--- a/devtools/print_wire.c
+++ b/devtools/print_wire.c
@@ -51,6 +51,17 @@ bool printwire_u64(const char *fieldname, const u8 **cursor, size_t *plen)
 	return true;
 }
 
+bool printwire_bigsize(const char *fieldname, const u8 **cursor, size_t *plen)
+{
+	u64 v = fromwire_bigsize(cursor, plen);
+	if (!*cursor) {
+		printf("**TRUNCATED bigsize %s**\n", fieldname);
+		return false;
+	}
+	printf("%"PRIu64"\n", v);
+	return true;
+}
+
 bool printwire_s8(const char *fieldname, const u8 **cursor, size_t *plen)
 {
 	s8 v = fromwire_s8(cursor, plen);
diff --git a/devtools/print_wire.h b/devtools/print_wire.h
index 54536d7ef046..6886b5129e1e 100644
--- a/devtools/print_wire.h
+++ b/devtools/print_wire.h
@@ -13,13 +13,13 @@ struct tlv_print_record_type {
 };
 
 typedef u64 bigsize;
-#define printwire_bigsize printwire_u64
 struct wireaddr;
 
 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_bigsize(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);
diff --git a/wire/Makefile b/wire/Makefile
index f9660294b591..5bcabd9708ec 100644
--- a/wire/Makefile
+++ b/wire/Makefile
@@ -40,6 +40,7 @@ WIRE_OBJS := $(WIRE_SRC:.c=.o) common/sciddir_or_pubkey.o
 WIRE_PRINT_OBJS := $(WIRE_PRINT_SRC:.c=.o)
 WIRE_BOLT12_OBJS := $(WIRE_BOLT12_SRC:.c=.o)
 $(WIRE_OBJS) $(WIRE_PRINT_OBJS) $(WIRE_BOLT12_OBJS): $(WIRE_HEADERS) $(WIRE_PRINT_HEADERS)
+$(WIRE_PRINT_OBJS): devtools/print_wire.h
 
 ALL_C_SOURCES += $(WIRE_SRC) $(WIRE_BOLT12_SRC) $(WIRE_PRINT_SRC)