diff --git a/examples/RICH/scripts/richsim.py b/examples/RICH/scripts/richsim.py
index 2dca44a7c7e0c763d576522ba678fa9ee718140f..e7565f7477723a57e924ff6511664224516c6654 100755
--- a/examples/RICH/scripts/richsim.py
+++ b/examples/RICH/scripts/richsim.py
@@ -77,6 +77,7 @@ if __name__ == "__main__":
 
     # Output file (assuming CWD)
     SIM.outputFile = "sim.root"
+    SIM.outputConfig.forceDD4HEP = True
 
     # Override with user options
     SIM.parseOptions()