diff --git a/Trigger/TrigAlgorithms/TrigCaloRec/src/TrigL1FCALTTSumFex.cxx b/Trigger/TrigAlgorithms/TrigCaloRec/src/TrigL1FCALTTSumFex.cxx
index f1a11a8494920b75d688dcfc9ad625cef32bca1f..f18b70608b9b614717054ea9c3ec32593d940009 100644
--- a/Trigger/TrigAlgorithms/TrigCaloRec/src/TrigL1FCALTTSumFex.cxx
+++ b/Trigger/TrigAlgorithms/TrigCaloRec/src/TrigL1FCALTTSumFex.cxx
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
 */
 
 
@@ -64,7 +64,7 @@ HLT::ErrorCode TrigL1FCALTTSumFex::hltExecute(
        const xAOD::TriggerTower* tt = container->at(i);
        double etaTower = tt->eta();
        count_all++;
-       if ( fabsf(etaTower) < 3.1 ) continue;
+       if ( std::fabs(etaTower) < 3.1 ) continue;
        count_fcal++;
        if ( etaTower > 0 ) {
 	if ( etaTower < eta_min_pos ) eta_min_pos = etaTower;