diff --git a/lib/lock_and_cache.rb b/lib/lock_and_cache.rb
index <HASH>..<HASH> 100644
--- a/lib/lock_and_cache.rb
+++ b/lib/lock_and_cache.rb
@@ -177,7 +177,6 @@ module LockAndCache
           end
         ensure
           done = true
-          lock_extender.exit if lock_extender.alive?
           lock_extender.join if lock_extender.status.nil?
         end
       end
don't be too eager to kill the lock extender thread