diff --git a/boltons/cacheutils.py b/boltons/cacheutils.py
index 7c277a1..d7dad4e 100644
--- a/boltons/cacheutils.py
+++ b/boltons/cacheutils.py
@@ -39,7 +39,7 @@ import itertools
 from collections import deque
 
 try:
-    from _thread import RLock
+    from threading import RLock
 except:
     class RLock(object):
         'Dummy reentrant lock for builds without threads'