diff --git a/examples/RICH/scripts/richsim.py b/examples/RICH/scripts/richsim.py
index 2dca44a7c..e7565f747 100755
--- a/examples/RICH/scripts/richsim.py
+++ b/examples/RICH/scripts/richsim.py
@@ -77,6 +77,7 @@ def setupCerenkov(kernel):
 
     # Output file (assuming CWD)
     SIM.outputFile = "sim.root"
+    SIM.outputConfig.forceDD4HEP = True
 
     # Override with user options
     SIM.parseOptions()