1 files changed, 2 insertions, 1 deletions
diff --git a/lib9p/9p.c b/lib9p/9p.c
index 8d53815..90a2b0d 100644
--- a/lib9p/9p.c
+++ b/lib9p/9p.c
@@ -62,7 +62,8 @@ ssize_t lib9p_unmarshal_size(struct lib9p_ctx *ctx, uint8_t *net_bytes) {
 	/* Body */
 	struct _vtable_msg vtable = _lib9p_vtables[ctx->version].msgs[typ];
 	if (!vtable.unmarshal_extrasize)
-		return lib9p_errorf(ctx, LINUX_EOPNOTSUPP, "unknown message type %"PRIu8, typ);
+		return lib9p_errorf(ctx, LINUX_EOPNOTSUPP, "unknown message type %s",
+		                    lib9p_msg_type_str(typ));
 	if (vtable.unmarshal_extrasize(&subctx))
 		return -1;