diff --git a/lib/socket.h b/lib/socket.h
index e33e238b9..89b523dfb 100644
--- a/lib/socket.h
+++ b/lib/socket.h
@@ -119,7 +119,7 @@ INLINE char *sockaddr_print_buf(const sockaddr_t *a) {
 	char *buf = get_thread_buf();
 	if (!a->family) {
 		buf[0] = '\0';
-		return 0;
+		return buf;
 	}
 	sockaddr_print(a, buf, THREAD_BUF_SIZE);
 	return buf;