diff --git a/Lib/threading.py b/Lib/threading.py
index 27a5511..51205fa 100644
--- a/Lib/threading.py
+++ b/Lib/threading.py
@@ -565,7 +565,7 @@
 
     def _reset_internal_locks(self):
         # private!  called by Thread._reset_internal_locks by _after_fork()
-        self.__cond.__init__()
+        self.__cond.__init__(Lock())
 
     def isSet(self):
         'Return true if and only if the internal flag is true.'