diff --git a/src/tools/mac/symupload/symupload.m b/src/tools/mac/symupload/symupload.m
index fe0cb67c..fe413458 100644
--- a/src/tools/mac/symupload/symupload.m
+++ b/src/tools/mac/symupload/symupload.m
@@ -134,7 +134,8 @@ static void Start(Options *options) {
   fprintf(stdout, "Send: %s\n", error ? [[error description] UTF8String] :
           "No Error");
   fprintf(stdout, "Response: %d\n", status);
-  fprintf(stdout, "Result: %lu bytes\n%s\n", [data length], [result UTF8String]);
+  fprintf(stdout, "Result: %lu bytes\n%s\n",
+          (unsigned long)[data length], [result UTF8String]);
 
   [result release];
   [ul release];