diff --git a/Simulation/ISF/ISF_Geant4/ISF_Geant4Tools/python/ISF_Geant4ToolsConfig.py b/Simulation/ISF/ISF_Geant4/ISF_Geant4Tools/python/ISF_Geant4ToolsConfig.py
index 4f3989c7c1df09adef2de1b1497275df682b70f9..53beb13df480865f406401cb172062dc1cf2990f 100644
--- a/Simulation/ISF/ISF_Geant4/ISF_Geant4Tools/python/ISF_Geant4ToolsConfig.py
+++ b/Simulation/ISF/ISF_Geant4/ISF_Geant4Tools/python/ISF_Geant4ToolsConfig.py
@@ -55,7 +55,7 @@ def Geant4ToolCfg(flags, name="ISF_Geant4Tool", **kwargs):
 
     # Workaround to keep other simulation flavours working while we migrate everything to be AthenaMT-compatible.
     from SimulationConfig.SimEnums import SimulationFlavour
-    if flags.Sim.ISF.Simulator in [SimulationFlavour.FullG4MT, SimulationFlavour.FullG4MT_QS, SimulationFlavour.PassBackG4MT, SimulationFlavour.ATLFAST3MT, SimulationFlavour.ATLFAST3MT_QS]:
+    if flags.Sim.ISF.Simulator in [SimulationFlavour.ATLFAST3F_ACTSMT, SimulationFlavour.FullG4MT, SimulationFlavour.FullG4MT_QS, SimulationFlavour.PassBackG4MT, SimulationFlavour.ATLFAST3MT, SimulationFlavour.ATLFAST3MT_QS]:
         acc.setPrivateTools(CompFactory.iGeant4.G4TransportTool(name, **kwargs))
     else:
         kwargs.setdefault("G4RunManagerHelper", acc.addPublicTool(acc.popToolsAndMerge(G4RunManagerHelperCfg(flags))))