diff --git a/hgext3rd/gitrevset.py b/hgext3rd/gitrevset.py
--- a/hgext3rd/gitrevset.py
+++ b/hgext3rd/gitrevset.py
@@ -15,7 +15,7 @@
 
 from __future__ import absolute_import
 
-from mercurial (
+from mercurial import (
     error,
     extensions,
     hg,