diff --git a/direct/src/showbase/ShowBase.py b/direct/src/showbase/ShowBase.py
index 2ce7103cb6..d187bd215b 100644
--- a/direct/src/showbase/ShowBase.py
+++ b/direct/src/showbase/ShowBase.py
@@ -274,6 +274,10 @@ class ShowBase(DirectObject.DirectObject):
         # Now we can make the TaskManager start using the new globalClock.
         taskMgr.globalClock = globalClock
 
+        affinity = self.config.GetInt('client-cpu-affinity', -1)
+        if affinity != -1:
+            TrueClock.getGlobalPtr().setCpuAffinity(1 << affinity)
+
         __builtin__.base = self
         __builtin__.render2d = self.render2d
         __builtin__.aspect2d = self.aspect2d