diff --git a/Trigger/TrigValidation/TriggerTest/share/testLVL1CTPAthenaTrigRDO.py b/Trigger/TrigValidation/TriggerTest/share/testLVL1CTPAthenaTrigRDO.py
index fa219cefafd1ca2e91f772d75c007acfb5454004..75190797d1a6db70251484e2dda79e097a5e484b 100644
--- a/Trigger/TrigValidation/TriggerTest/share/testLVL1CTPAthenaTrigRDO.py
+++ b/Trigger/TrigValidation/TriggerTest/share/testLVL1CTPAthenaTrigRDO.py
@@ -65,6 +65,9 @@ GenerateMenu.overwriteSignaturesWith(L1Only)
 include("RecExCommon/RecExCommon_topOptions.py")
 #-----------------------------------------------------------
 
+from LumiBlockComps.LumiBlockMuWriterDefault import LumiBlockMuWriterDefault
+LumiBlockMuWriterDefault()
+
 #------------------------------------------------------------
 include("TriggerTest/TriggerTestCommon.py")
 #------------------------------------------------------------