diff --git a/lib/controller/controller.py b/lib/controller/controller.py
index a05adf049..5e321f6a3 100644
--- a/lib/controller/controller.py
+++ b/lib/controller/controller.py
@@ -97,7 +97,7 @@ def start():
         return
 
     if conf.optimize:
-        conf.useCommonPrediction = conf.useNullConnection = True
+        conf.useCommonPrediction = conf.useNullConnection = conf.keepAlive = True
 
 
     if conf.smokeTest: