diff --git a/git_command.py b/git_command.py
index 9bed799..5988cc2 100644
--- a/git_command.py
+++ b/git_command.py
@@ -89,7 +89,7 @@
       if ver_str.startswith('git version '):
         _git_version = tuple(
           map(lambda x: int(x),
-            ver_str[len('git version '):].strip().split('.')[0:3]
+            ver_str[len('git version '):].strip().split('-')[0].split('.')[0:3]
           ))
       else:
         print >>sys.stderr, 'fatal: "%s" unsupported' % ver_str