diff --git a/Simulation/ISF/ISF_Core/ISF_Algorithms/python/CollectionMergerConfig.py b/Simulation/ISF/ISF_Core/ISF_Algorithms/python/CollectionMergerConfig.py
index 62512bfe131274d9b14879c565f3b1f965194b4a..34c09d52ff5278f4dd26093de32388f19c1f14a9 100644
--- a/Simulation/ISF/ISF_Core/ISF_Algorithms/python/CollectionMergerConfig.py
+++ b/Simulation/ISF/ISF_Core/ISF_Algorithms/python/CollectionMergerConfig.py
@@ -33,7 +33,7 @@ def ISFCollectionMergerCfg(flags,name="ISF_CollectionMerger", **kwargs):
     kwargs.setdefault( "InputMMHits",               [ ] )
 
     hardscatterSG=""
-    if flags.hasFlag("Digitization.Pileup"):
+    if flags.hasFlag("Digitization.PileUp"):
         if flags.Sim.DoFullChain and (flags.Digitization.PileUp is True):
             hardscatterSG = "OriginalEvent_SG+"
     else: