diff --git a/DataFormats/BTauReco/interface/TaggingVariable.h b/DataFormats/BTauReco/interface/TaggingVariable.h
index ff85997f7e1a5..a632e29451844 100644
--- a/DataFormats/BTauReco/interface/TaggingVariable.h
+++ b/DataFormats/BTauReco/interface/TaggingVariable.h
@@ -195,6 +195,7 @@ namespace reco {
   public:
     TaggingVariableList() : m_list() {}
     TaggingVariableList(const TaggingVariableList& list) : m_list(list.m_list) {}
+    TaggingVariableList& operator=(const TaggingVariableList&) = default;
 
     // [begin, end) must identify a valid range of iterators to TaggingVariableList
     template <typename InputIterator>
diff --git a/DataFormats/EgammaCandidates/interface/Photon.h b/DataFormats/EgammaCandidates/interface/Photon.h
index 25522830a816b..d6e6e1da91fc2 100644
--- a/DataFormats/EgammaCandidates/interface/Photon.h
+++ b/DataFormats/EgammaCandidates/interface/Photon.h
@@ -40,6 +40,9 @@ namespace reco {
     /// constructor from values
     Photon(const LorentzVector& p4, const Point& caloPos, const PhotonCoreRef& core, const Point& vtx = Point(0, 0, 0));
 
+    /// assignment operator
+    Photon& operator=(const Photon&) = default;
+
     /// destructor
     ~Photon() override;
 
diff --git a/DataFormats/METReco/interface/CorrMETData.h b/DataFormats/METReco/interface/CorrMETData.h
index 54c895d63dc86..d46c99cb02815 100644
--- a/DataFormats/METReco/interface/CorrMETData.h
+++ b/DataFormats/METReco/interface/CorrMETData.h
@@ -21,6 +21,8 @@ struct CorrMETData {
 
   CorrMETData(const CorrMETData& corr) : mex(corr.mex), mey(corr.mey), sumet(corr.sumet) {}
 
+  CorrMETData& operator=(const CorrMETData&) = default;
+
   CorrMETData& operator+=(const CorrMETData& rhs) {
     mex += rhs.mex;
     mey += rhs.mey;
diff --git a/DataFormats/METReco/interface/HcalHaloData.h b/DataFormats/METReco/interface/HcalHaloData.h
index c13694d54241b..1ad3f6e86026c 100644
--- a/DataFormats/METReco/interface/HcalHaloData.h
+++ b/DataFormats/METReco/interface/HcalHaloData.h
@@ -30,6 +30,7 @@ struct HaloTowerStrip {
     energyRatio = strip.energyRatio;
     emEt = strip.emEt;
   }
+  HaloTowerStrip& operator=(const HaloTowerStrip&) = default;
 };
 
 namespace reco {
diff --git a/DataFormats/ParticleFlowReco/interface/PFTrack.h b/DataFormats/ParticleFlowReco/interface/PFTrack.h
index 16d5f93cb6799..4a7d3edd04ffb 100644
--- a/DataFormats/ParticleFlowReco/interface/PFTrack.h
+++ b/DataFormats/ParticleFlowReco/interface/PFTrack.h
@@ -68,6 +68,8 @@ namespace reco {
 
     PFTrack(const PFTrack& other);
 
+    PFTrack& operator=(const PFTrack& other) = default;
+
     /// add a trajectory measurement
     /// \todo throw an exception if the number of points is too large
     void addPoint(const reco::PFTrajectoryPoint& trajPt);
diff --git a/DataFormats/SiStripCommon/interface/SiStripFecKey.h b/DataFormats/SiStripCommon/interface/SiStripFecKey.h
index 527588e943333..516835ded7419 100644
--- a/DataFormats/SiStripCommon/interface/SiStripFecKey.h
+++ b/DataFormats/SiStripCommon/interface/SiStripFecKey.h
@@ -73,6 +73,9 @@ class SiStripFecKey : public SiStripKey {
   /** Default constructor */
   SiStripFecKey();
 
+  /** Assignment operator */
+  SiStripFecKey& operator=(const SiStripFecKey&) = default;
+
   // ---------- Control structure ----------
 
   /** Returns VME crate. */
diff --git a/DataFormats/SiStripCommon/interface/SiStripFedKey.h b/DataFormats/SiStripCommon/interface/SiStripFedKey.h
index e5466e8ceac71..71cf30ea189a6 100644
--- a/DataFormats/SiStripCommon/interface/SiStripFedKey.h
+++ b/DataFormats/SiStripCommon/interface/SiStripFedKey.h
@@ -78,6 +78,9 @@ class SiStripFedKey : public SiStripKey {
   /** Default constructor */
   SiStripFedKey();
 
+  /** Assignment operator */
+  SiStripFedKey& operator=(const SiStripFedKey&) = default;
+
   // ---------- Public interface to member data ----------
 
   /** Returns FED id. */