diff --git a/Simulation/G4Atlas/G4AtlasApps/python/PyG4Atlas.py b/Simulation/G4Atlas/G4AtlasApps/python/PyG4Atlas.py
index 4c6124342185123bca4c5dd3de7b71be7fc32cd5..5e03a1a93a04e87964fc68661c07a9a7031c8c9a 100644
--- a/Simulation/G4Atlas/G4AtlasApps/python/PyG4Atlas.py
+++ b/Simulation/G4Atlas/G4AtlasApps/python/PyG4Atlas.py
@@ -142,7 +142,7 @@ class G4AtlasEngine:
             G4AtlasEngine.log.debug(' G4AtlasEngine: _init_G4: init Geant4 ')
             if G4AtlasEngine.log.level <= 30:
                 from G4AtlasApps.SimFlags import simFlags
-                simFlags.g4Commands += ['/run/verbose 2'] # FIXME make configurable based on Athena message level?
+                simFlags.G4Commands += ['/run/verbose 2'] # FIXME make configurable based on Athena message level?
             G4AtlasEngine._ctrl.initializeG4(is_hive)
             self._InitList.append('init_G4')
             G4AtlasEngine._app_profiler('_init_G4: ')