diff --git a/DQM/EcalMonitorClient/src/MLClient.cc b/DQM/EcalMonitorClient/src/MLClient.cc
index bc84593b0145f..38bbef854478c 100644
--- a/DQM/EcalMonitorClient/src/MLClient.cc
+++ b/DQM/EcalMonitorClient/src/MLClient.cc
@@ -59,7 +59,7 @@ namespace ecaldqm {
     double pu = sPU.getFloatValue();
 
     //Do not compute ML quality if PU is non existent.
-    if (pu < 0.) {
+    if (pu <= 0.) {
       return;
     }
     uint32_t mask(1 << EcalDQMStatusHelper::PEDESTAL_ONLINE_HIGH_GAIN_RMS_ERROR |
diff --git a/DQM/EcalMonitorTasks/src/EnergyTask.cc b/DQM/EcalMonitorTasks/src/EnergyTask.cc
index 7670fce2e20dd..775882335db8a 100644
--- a/DQM/EcalMonitorTasks/src/EnergyTask.cc
+++ b/DQM/EcalMonitorTasks/src/EnergyTask.cc
@@ -39,13 +39,13 @@ namespace ecaldqm {
     MESet& meHit(MEs_.at("Hit"));
     MESet& meHitAll(MEs_.at("HitAll"));
 
-    uint32_t neitherGoodNorPoorCalib(~(0x1 << EcalRecHit::kGood | 0x1 << EcalRecHit::kPoorCalib));
-    uint32_t neitherGoodNorOOT(~(0x1 << EcalRecHit::kGood | 0x1 << EcalRecHit::kOutOfTime));
+    uint32_t goodORPoorCalibBits(0x1 << EcalRecHit::kGood | 0x1 << EcalRecHit::kPoorCalib);
+    uint32_t goodOROOTBits(0x1 << EcalRecHit::kGood | 0x1 << EcalRecHit::kOutOfTime);
 
     for (EcalRecHitCollection::const_iterator hitItr(_hits.begin()); hitItr != _hits.end(); ++hitItr) {
-      if (isPhysicsRun_ && hitItr->checkFlagMask(neitherGoodNorPoorCalib))
+      if (isPhysicsRun_ && !hitItr->checkFlagMask(goodORPoorCalibBits))
         continue;
-      if (!isPhysicsRun_ && hitItr->checkFlagMask(neitherGoodNorOOT))
+      if (!isPhysicsRun_ && !hitItr->checkFlagMask(goodOROOTBits))
         continue;
 
       float energy(hitItr->energy());
diff --git a/DQM/EcalMonitorTasks/src/OccupancyTask.cc b/DQM/EcalMonitorTasks/src/OccupancyTask.cc
index 364840cc193a9..205ef11d7d2e1 100644
--- a/DQM/EcalMonitorTasks/src/OccupancyTask.cc
+++ b/DQM/EcalMonitorTasks/src/OccupancyTask.cc
@@ -198,7 +198,7 @@ namespace ecaldqm {
     MESet& meRecHitThr1D(MEs_.at("RecHitThr1D"));
     MESet& meTrendNRecHitThr(MEs_.at("TrendNRecHitThr"));
 
-    uint32_t mask(~(0x1 << EcalRecHit::kGood));
+    uint32_t goodBits(0x1 << EcalRecHit::kGood);
     double nFiltered(0.);
 
     float nRHThrp(0), nRHThrm(0);
@@ -210,7 +210,7 @@ namespace ecaldqm {
       meRecHitProjEta.fill(getEcalDQMSetupObjects(), id);
       meRecHitProjPhi.fill(getEcalDQMSetupObjects(), id);
 
-      if (!hit.checkFlagMask(mask) && hit.energy() > recHitThreshold_) {
+      if (hit.checkFlagMask(goodBits) && hit.energy() > recHitThreshold_) {
         meRecHitThrProjEta.fill(getEcalDQMSetupObjects(), id);
         meRecHitThrProjPhi.fill(getEcalDQMSetupObjects(), id);
         meRecHitThrAll.fill(getEcalDQMSetupObjects(), id);
diff --git a/DQM/EcalMonitorTasks/src/TimingTask.cc b/DQM/EcalMonitorTasks/src/TimingTask.cc
index bb00f7d266dae..5bd6b365ed5aa 100644
--- a/DQM/EcalMonitorTasks/src/TimingTask.cc
+++ b/DQM/EcalMonitorTasks/src/TimingTask.cc
@@ -69,11 +69,11 @@ namespace ecaldqm {
     MESet& meTime1D(MEs_.at("Time1D"));
     MESet& meChi2(MEs_.at("Chi2"));
 
-    uint32_t mask(~((0x1 << EcalRecHit::kGood) | (0x1 << EcalRecHit::kOutOfTime)));
+    uint32_t goodOROOTBits(0x1 << EcalRecHit::kGood | 0x1 << EcalRecHit::kOutOfTime);
     int signedSubdet;
 
     std::for_each(_hits.begin(), _hits.end(), [&](EcalRecHitCollection::value_type const& hit) {
-      if (hit.checkFlagMask(mask))
+      if (!hit.checkFlagMask(goodOROOTBits))
         return;
 
       DetId id(hit.id());