diff --git a/hgext/rebase.py b/hgext/rebase.py
--- a/hgext/rebase.py
+++ b/hgext/rebase.py
@@ -52,8 +52,6 @@
     util,
 )
 
-release = lock.release
-
 # The following constants are used throughout the rebase module. The ordering of
 # their values must be maintained.