diff --git a/Trigger/TrigValidation/TrigValTools/share/TrigValInputs.json b/Trigger/TrigValidation/TrigValTools/share/TrigValInputs.json
index 883713657388b21389002c470e4b40fcb744700d..e4a705f1de379637c1630a2730c31a4df8a3b003 100644
--- a/Trigger/TrigValidation/TrigValTools/share/TrigValInputs.json
+++ b/Trigger/TrigValidation/TrigValTools/share/TrigValInputs.json
@@ -56,6 +56,13 @@
             "/cvmfs/atlas-nightlies.cern.ch/repo/data/data-art/TriggerTest/valid1.410000.PowhegPythiaEvtGen_P2012_ttbar_hdamp172p5_nonallhad.merge.RDO.e4993_s3214_r11315/RDO.17533168._000002.pool.root.1"
         ]
     },
+    "ttbar_phase1": {
+        "source": "mc",
+        "format": "RDO",
+        "paths": [
+            "/cvmfs/atlas-nightlies.cern.ch/repo/data/data-art/TriggerTest/valid1.410000.PowhegPythiaEvtGen_P2012_ttbar_hdamp172p5_nonallhad.merge.RDO.e4993_s3214_d1536_tid18795273_00/RDO.18795273._000063.pool.root.1"
+        ]
+    },
     "ttbar_ID": {
         "source": "mc",
         "format": "RDO",
diff --git a/Trigger/TrigValidation/TriggerTest/test/test_trig_mc_v1Dev_L1SimOnly_phase1_build.py b/Trigger/TrigValidation/TriggerTest/test/test_trig_mc_v1Dev_L1SimOnly_phase1_build.py
index 6acd4e74a860c6ad85027efe9afff8750660b57d..f347c93b68225bcf088115f8ed244f646db3b4f8 100755
--- a/Trigger/TrigValidation/TriggerTest/test/test_trig_mc_v1Dev_L1SimOnly_phase1_build.py
+++ b/Trigger/TrigValidation/TriggerTest/test/test_trig_mc_v1Dev_L1SimOnly_phase1_build.py
@@ -12,7 +12,7 @@ from TrigValTools.TrigValSteering import Test, ExecStep, CheckSteps
 ex = ExecStep.ExecStep()
 ex.type = 'athena'
 ex.job_options = 'TriggerJobOpts/runHLT_standalone.py'
-ex.input = 'ttbar'
+ex.input = 'ttbar_phase1'
 ex.threads = 1
 precommand = ''.join([
   "setMenu='LS2_v1';",  # LS2_v1 soon to be renamed to Dev_pp_run3_v1
diff --git a/Trigger/TriggerCommon/TriggerJobOpts/python/Lvl1SimulationConfig.py b/Trigger/TriggerCommon/TriggerJobOpts/python/Lvl1SimulationConfig.py
index fcbf85cb1c49b79cfdef2930088550ac100bdaf4..463e2b07dc49a51b16cc79034d277f38d06a2582 100644
--- a/Trigger/TriggerCommon/TriggerJobOpts/python/Lvl1SimulationConfig.py
+++ b/Trigger/TriggerCommon/TriggerJobOpts/python/Lvl1SimulationConfig.py
@@ -87,6 +87,10 @@ def Lvl1SimulationSequence( flags = None ):
             #conddb.addFolderWithTag("TRIGGER_OFL", l1calofolder, "HEAD")
             conddb.addFolder( "TRIGGER_OFL", l1calofolder )
 
+    if flags.Trigger.enableL1Phase1:
+        from AthenaCommon import CfgMgr
+        l1CaloSim += CfgMgr.LVL1__eFEXDriver('MyeFEXDriver')
+
     ##################################################
     # Muons
     ##################################################