diff --git a/Calibration/EcalCalibAlgos/src/EcalEleCalibLooper.cc b/Calibration/EcalCalibAlgos/src/EcalEleCalibLooper.cc
index ed2c5948c1bd3..c57a648ec1b53 100644
--- a/Calibration/EcalCalibAlgos/src/EcalEleCalibLooper.cc
+++ b/Calibration/EcalCalibAlgos/src/EcalEleCalibLooper.cc
@@ -257,7 +257,7 @@ EcalEleCalibLooper::duringLoop (const edm::Event& iEvent,
      double pTk = 0 ;
      std::map<int , double> xtlMap;
      DetId Max =0;
-     if (fabs(eleIt->eta()<1.49))
+     if (std::abs(eleIt->eta())<1.49)
 	     Max = EcalClusterTools::getMaximum(eleIt->superCluster()->hitsAndFractions(),barrelHitsCollection).first;
      else 
 	     Max = EcalClusterTools::getMaximum(eleIt->superCluster()->hitsAndFractions(),endcapHitsCollection).first;
diff --git a/Calibration/EcalCalibAlgos/src/InvRingCalib.cc b/Calibration/EcalCalibAlgos/src/InvRingCalib.cc
index 4a77cd1c9e78c..205ff5fc97b8c 100644
--- a/Calibration/EcalCalibAlgos/src/InvRingCalib.cc
+++ b/Calibration/EcalCalibAlgos/src/InvRingCalib.cc
@@ -315,7 +315,7 @@ InvRingCalib::duringLoop (const edm::Event& iEvent,
       pTk=eleIt->trackMomentumAtVtx().R();
       std::map<int , double> xtlMap;
       DetId Max=0; 
-      if (fabs(eleIt->eta()<1.49))
+      if (std::abs(eleIt->eta())<1.49)
 	     Max = EcalClusterTools::getMaximum(eleIt->superCluster()->hitsAndFractions(),barrelHitsCollection).first;
       else 
 	     Max = EcalClusterTools::getMaximum(eleIt->superCluster()->hitsAndFractions(),endcapHitsCollection).first;