diff --git a/MAC/APL/MainCU/src/MACScheduler/MACScheduler.conf.in b/MAC/APL/MainCU/src/MACScheduler/MACScheduler.conf.in
index ed9c486a187ff5e142c65ff6fd5a39ac561f72e8..bbccffe83410a4f6637dca32a92ebc7f4bc41b9b 100644
--- a/MAC/APL/MainCU/src/MACScheduler/MACScheduler.conf.in
+++ b/MAC/APL/MainCU/src/MACScheduler/MACScheduler.conf.in
@@ -33,4 +33,4 @@ ParsetQueuename = lofar.task.specification.system
 
 # Pipelines on cluster X can be ignored by the MACScheduler with this key.
 # use e.g. 'CEP2' or 'CEP4'
-excludePipelinesOnThisCluster = ''
+excludePipelinesOnThisCluster = '!CEP4'