diff --git a/DQMOffline/Lumi/plugins/ZCounting.h b/DQMOffline/Lumi/plugins/ZCounting.h
index 636e2fe73b5b7..f4726db69c572 100644
--- a/DQMOffline/Lumi/plugins/ZCounting.h
+++ b/DQMOffline/Lumi/plugins/ZCounting.h
@@ -94,8 +94,8 @@ class ZCounting : public DQMEDAnalyzer {
   TriggerTools* triggers;
 
   // constants
-  const double DRMAX_HLT = 0.01;  // max dR matching between muon and hlt object
-  const double DRMAX_IO = 0.09;   // max dR matching between inner and outer muon track
+  const double DRMAX_HLT = 0.01;  // max deltaR^2 matching between muon and hlt object
+  const double DRMAX_IO = 0.09;   // max deltaR^2 matching between inner and outer muon track
 
   const double MIN_PT_TRK = 15;    // minimum pT of inner track considered for matching outer to inner track
   const double MAX_ETA_TRK = 2.5;  // maximum |eta| of inner track considered for matching outer to inner track
diff --git a/DQMOffline/Lumi/src/TriggerTools.cc b/DQMOffline/Lumi/src/TriggerTools.cc
index b26d60941f5d6..404482870c646 100644
--- a/DQMOffline/Lumi/src/TriggerTools.cc
+++ b/DQMOffline/Lumi/src/TriggerTools.cc
@@ -144,7 +144,7 @@ bool TriggerTools::passObj(const double eta, const double phi) const {
       for (unsigned int hlto = 0; hlto < keys.size(); hlto++) {
         trigger::size_type hltf = keys[hlto];
         const trigger::TriggerObject& tobj(toc[hltf]);
-        if (reco::deltaR(eta, phi, tobj.eta(), tobj.phi()) < DRMAX) {
+        if (reco::deltaR2(eta, phi, tobj.eta(), tobj.phi()) < DRMAX) {
           return true;
         }
       }