diff --git a/webtools/tinderbox/warnings.pl b/webtools/tinderbox/warnings.pl
index cc25382678e..5dfe979c806 100755
--- a/webtools/tinderbox/warnings.pl
+++ b/webtools/tinderbox/warnings.pl
@@ -412,7 +412,7 @@ sub build_url {
 sub file_url {
   my ($file, $linenum) = @_;
 
-  return "../../bonsai/cvsblame.cgi"
+  return "http://cvs-mirror.mozilla.org/webtools/bonsai/cvsblame.cgi"
         ."?file=mozilla/$file&mark=$linenum#".($linenum-10);
 
 }