diff --git a/Tools/PyUtils/python/scripts/diff_root_files.py b/Tools/PyUtils/python/scripts/diff_root_files.py
index a114172dd3da13837ceeb25630f28f65e71a82a9..0b071a55263793d6f3d9e44ea85306d0f00e6a1c 100644
--- a/Tools/PyUtils/python/scripts/diff_root_files.py
+++ b/Tools/PyUtils/python/scripts/diff_root_files.py
@@ -167,6 +167,9 @@ def main(args):
             if hasattr(tree,'xAOD::EventAuxInfo_v2_EventInfoAux.'):
                 event_info = getattr(tree,'xAOD::EventAuxInfo_v2_EventInfoAux.')
                 event_number = event_info.eventNumber
+            elif hasattr(tree,'xAOD::EventAuxInfo_v2_Bkg_EventInfoAux.'):
+                event_info = getattr(tree,'xAOD::EventAuxInfo_v2_Bkg_EventInfoAux.')
+                event_number = event_info.eventNumber
             elif hasattr(tree,'xAOD::EventAuxInfo_v1_EventInfoAux.'):
                 event_info = getattr(tree,'xAOD::EventAuxInfo_v1_EventInfoAux.')
                 event_number = event_info.eventNumber