--- OLD/clientname.c	Thu Jan  1 00:00:00 1970
+++ NEW/clientname.c	Thu Jan  1 00:00:00 1970
@@ -277,8 +277,8 @@
 
 		if (ai->ai_addrlen < sizeof(struct sockaddr_in6)) {
 			rprintf(FERROR,
-				"%s: too short sockaddr_in6; length=%d\n",
-				fn, ai->ai_addrlen);
+				"%s: too short sockaddr_in6; length=%lu\n",
+				fn, (unsigned long int) ai->ai_addrlen);
 			return 1;
 		}