diff --git a/Lib/tempfile.py b/Lib/tempfile.py
index dff2ae9..d3ec9a4 100644
--- a/Lib/tempfile.py
+++ b/Lib/tempfile.py
@@ -98,19 +98,17 @@
     """
 
     vars = globals()
-    lock = _once_lock
-
     # Check first outside the lock.
     if vars.get(var) is not None:
         return
     try:
-        lock.acquire()
+        _once_lock.acquire()
         # Check again inside the lock.
         if vars.get(var) is not None:
             return
         vars[var] = initializer()
     finally:
-        lock.release()
+        _once_lock.release()
 
 class _RandomNameSequence:
     """An instance of _RandomNameSequence generates an endless