diff --git a/Trigger/TrigHypothesis/TrigEgammaHypo/src/TrigL2ElectronFexMT.cxx b/Trigger/TrigHypothesis/TrigEgammaHypo/src/TrigL2ElectronFexMT.cxx
index 3749267d4d52da9c9ef1f56523c1ea9fa5cedad8..de1e96cff4e6f1c6f2ba40979e69cab2cf214574 100644
--- a/Trigger/TrigHypothesis/TrigEgammaHypo/src/TrigL2ElectronFexMT.cxx
+++ b/Trigger/TrigHypothesis/TrigEgammaHypo/src/TrigL2ElectronFexMT.cxx
@@ -158,7 +158,7 @@ StatusCode TrigL2ElectronFexMT::execute() {
     return StatusCode::SUCCESS;
   }
 
-  TrigRoiDescriptor* roiDescriptor = *(roiCollection->begin());
+  const TrigRoiDescriptor* roiDescriptor = *(roiCollection->begin());
 
   ATH_MSG_DEBUG(" RoI ID = "   << (roiDescriptor)->roiId()
 		<< ": Eta = "      << (roiDescriptor)->eta()