diff --git a/direct/src/distributed/ClockDelta.py b/direct/src/distributed/ClockDelta.py
index 54330ac951..7f8da75706 100644
--- a/direct/src/distributed/ClockDelta.py
+++ b/direct/src/distributed/ClockDelta.py
@@ -1,7 +1,7 @@
 # ClockDelta provides the ability to use clock synchronization for
 # distributed objects
 
-from panda3d.core import ClockObject
+from panda3d.core import ClockObject, ConfigVariableBool
 from direct.directnotify import DirectNotifyGlobal
 from direct.showbase import DirectObject
 import math