diff --git a/Trigger/TrigHypothesis/TrigEgammaHypo/src/TrigL2ElectronFexMT.cxx b/Trigger/TrigHypothesis/TrigEgammaHypo/src/TrigL2ElectronFexMT.cxx
index c8c7d5220c51247248f41dbda26c93e5cfbce6b2..8e704876d432a912f15203fe0f9176e5b8706ce2 100644
--- a/Trigger/TrigHypothesis/TrigEgammaHypo/src/TrigL2ElectronFexMT.cxx
+++ b/Trigger/TrigHypothesis/TrigEgammaHypo/src/TrigL2ElectronFexMT.cxx
@@ -121,7 +121,7 @@ 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()