diff --git a/kafka-patch-review.py b/kafka-patch-review.py
index 7fa6cb5..0a877fa 100644
--- a/kafka-patch-review.py
+++ b/kafka-patch-review.py
@@ -80,7 +80,7 @@ def main():
   if opt.debug: 
     print 'rb url=',rb_url
  
-  git_command="git diff " + opt.branch + " > " + patch_file
+  git_command="git diff %s... > %s" % (opt.branch, patch_file)
   if opt.debug:
     print git_command
   p=os.popen(git_command)