diff --git a/lib/krb5/changepw.c b/lib/krb5/changepw.c
index 7dfffb636..e09fa5a7b 100644
--- a/lib/krb5/changepw.c
+++ b/lib/krb5/changepw.c
@@ -319,7 +319,7 @@ process_reply (krb5_context context,
 
     if (len < 6) {
 	str2data (result_string, "server %s sent to too short message "
-		  "(%d bytes)", host, len);
+		  "(%ld bytes)", host, (long)len);
 	*result_code = KRB5_KPASSWD_MALFORMED;
 	return 0;
     }