diff --git a/main.py b/main.py
index 5c8772c..665a655 100755
--- a/main.py
+++ b/main.py
@@ -209,8 +209,8 @@
     cp %s %s
 """ % (exp_str, _MyWrapperPath(), repo_path)
 
-def _CheckRepoDir(dir):
-  if not dir:
+def _CheckRepoDir(repo_dir):
+  if not repo_dir:
     print >>sys.stderr, 'no --repo-dir argument'
     sys.exit(1)