diff --git a/IORawData/DTCommissioning/plugins/DTNewROS8FileReader.cc b/IORawData/DTCommissioning/plugins/DTNewROS8FileReader.cc
index 9b230fbc92e8d..fc7d7e1195550 100644
--- a/IORawData/DTCommissioning/plugins/DTNewROS8FileReader.cc
+++ b/IORawData/DTCommissioning/plugins/DTNewROS8FileReader.cc
@@ -100,7 +100,7 @@ int DTNewROS8FileReader::fillRawData(Event& e,
     //2.- Get the HEADER  ============================================================================
     int datahead[numberEventHeadWords];
     for (int iih = 0; iih < numberEventHeadWords; iih++) {
-      nread = inputFile.read(dataPointer<int>(&datahead[iih]), ros8WordLenght);
+      inputFile.read(dataPointer<int>(&datahead[iih]), ros8WordLenght);
     }
 
     //3.- ROS DATA  &  4.- PU DATA (Trigger)   =======================================================
diff --git a/IORawData/SiPixelInputSources/src/PixelSLinkDataInputSource.cc b/IORawData/SiPixelInputSources/src/PixelSLinkDataInputSource.cc
index b7a1fe2b7d771..61a75bad3f7da 100644
--- a/IORawData/SiPixelInputSources/src/PixelSLinkDataInputSource.cc
+++ b/IORawData/SiPixelInputSources/src/PixelSLinkDataInputSource.cc
@@ -259,8 +259,7 @@ bool PixelSLinkDataInputSource::setRunAndEventInfo(edm::EventID &id,
   // create product (raw data)
   buffers = std::make_unique<FEDRawDataCollection>();
 
-  //  uint32_t currenteventnumber = (m_data >> 32)&0x00ffffff;
-  uint32_t eventnumber = (m_data >> 32) & 0x00ffffff;
+  uint32_t eventnumber;
 
   do {
     std::vector<uint64_t> buffer;
diff --git a/JetMETCorrections/MCJet/bin/ReadTree.cc b/JetMETCorrections/MCJet/bin/ReadTree.cc
index a41cb75f28a35..df4fbc2630785 100644
--- a/JetMETCorrections/MCJet/bin/ReadTree.cc
+++ b/JetMETCorrections/MCJet/bin/ReadTree.cc
@@ -119,7 +119,6 @@ int main(int argc, char **argv) {
     if (cut_ptmin && cut_dR && cut_njets) {
       ind_pt = getBin(ptGen, pt_vec);
       ind_eta = getBin(etaJet, eta_vec);
-      resp = 0.;
       if (UseRatioForResponse && ptGen > 0)
         resp = ptJet / ptGen;
       else