diff --git a/source/App/EncoderApp/EncAppCfg.h b/source/App/EncoderApp/EncAppCfg.h
index 690174f38e0c1069f36406ba60289e8f93ce84fc..518bd9e199935190bf36b32dd51ab627270447f8 100644
--- a/source/App/EncoderApp/EncAppCfg.h
+++ b/source/App/EncoderApp/EncAppCfg.h
@@ -706,7 +706,7 @@ protected:
   ScalingListMode m_useScalingListId;                         ///< using quantization matrix
   std::string m_scalingListFileName;                          ///< quantization matrix file name
   bool      m_disableScalingMatrixForLfnstBlks;
-  bool      m_disableScalingMatrixForAlternativeColourSpace;
+  bool      m_disableScalingMatrixForAlternativeColourSpace=false;
   bool      m_scalingMatrixDesignatedColourSpace;
   CostMode  m_costMode;                                       ///< Cost mode to use
   bool      m_TSRCdisableLL;                                  ///< disable TSRC for lossless
diff --git a/source/Lib/CommonLib/NNFilterUnified.h b/source/Lib/CommonLib/NNFilterUnified.h
index a27f2e930a7564b09d1cb91d4bfc14bf827ece9d..18a9862777e75ca520c231e58b7c0443cd9b99d8 100644
--- a/source/Lib/CommonLib/NNFilterUnified.h
+++ b/source/Lib/CommonLib/NNFilterUnified.h
@@ -156,7 +156,7 @@ public:
   void              nnlfTransInput(bool b)                                       { m_nnlfTransInput = b;                  }
 #endif
 private:
-  int  m_blocksize[2];   // current inputs size
+  int  m_blocksize[2]={0,0};   // current inputs size
 #if JVET_AH0096_CONTENT_ADAPTIVE_LOP
   std::vector<int> m_input_quantizer;
   void resizeInputs(int width, int height, bool modelChange = false, bool useInputMultiplierSwitch = false);
diff --git a/source/Lib/EncoderLib/EncCfg.h b/source/Lib/EncoderLib/EncCfg.h
index bc7c37c4a1679010cbc0b3f8f0494d953f1def5f..9331bf39e3d00bf517bebdb6ceb70f5d0b6f0464 100644
--- a/source/Lib/EncoderLib/EncCfg.h
+++ b/source/Lib/EncoderLib/EncCfg.h
@@ -530,7 +530,7 @@ protected:
   HashType  m_decodedPictureHashSEIType;
   HashType  m_subpicDecodedPictureHashType;
   bool      m_bufferingPeriodSEIEnabled;
-  bool      m_pictureTimingSEIEnabled;
+  bool      m_pictureTimingSEIEnabled=false;
   bool      m_frameFieldInfoSEIEnabled;
   bool      m_dependentRAPIndicationSEIEnabled;
   bool      m_framePackingSEIEnabled;
@@ -541,7 +541,7 @@ protected:
   bool      m_parameterSetsInclusionIndicationSEIEnabled;
   bool      m_selfContainedClvsFlag;
   bool      m_bpDeltasGOPStructure;
-  bool      m_decodingUnitInfoSEIEnabled;
+  bool      m_decodingUnitInfoSEIEnabled=false;
 
   bool      m_scalableNestingSEIEnabled;
 
@@ -716,7 +716,7 @@ protected:
   uint32_t      m_maxNumIBCMergeCand;                 ///< Max number of IBC merge candidates
   ScalingListMode m_useScalingListId;             ///< Using quantization matrix i.e. 0=off, 1=default, 2=file.
   std::string m_scalingListFileName;              ///< quantization matrix file name
-  bool      m_disableScalingMatrixForAlternativeColourSpace;
+  bool      m_disableScalingMatrixForAlternativeColourSpace=false;
   bool      m_scalingMatrixDesignatedColourSpace;
   bool      m_sliceLevelRpl;                      ///< code reference picture lists in slice headers rather than picture header
   bool      m_sliceLevelDblk;                     ///< code deblocking filter parameters in slice headers rather than picture header
@@ -744,7 +744,7 @@ protected:
   int       m_RCInitialQP;
   bool      m_RCForceIntraQP;
 #if U0132_TARGET_BITS_SATURATION
-  bool      m_RCCpbSaturationEnabled;
+  bool      m_RCCpbSaturationEnabled=false;
   uint32_t      m_RCCpbSize;
   double    m_RCInitialCpbFullness;
 #endif
diff --git a/source/Lib/EncoderLib/EncLib.h b/source/Lib/EncoderLib/EncLib.h
index 9a4da4ba3d8389f47306cb740889d1a4942b23e5..ecf44fb8710b34a762ba83f9c609c0b704d4ceec 100644
--- a/source/Lib/EncoderLib/EncLib.h
+++ b/source/Lib/EncoderLib/EncLib.h
@@ -182,7 +182,7 @@ public:
   Ctx                       m_entropyCodingSyncContextState;      ///< leave in addition to vector for compatibility
   PLTBuf                    m_palettePredictorSyncState;
 #if ADAPTIVE_RPR
-  int                       m_iGOPRprPpsId;
+  int                       m_iGOPRprPpsId=0;
 #endif
   
 protected: