diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index 5546aec95c..76bc575c50 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -7948,7 +7948,7 @@ int Abc_CommandExact( Abc_Frame_t * pAbc, int argc, char ** argv )
     if ( argc == globalUtilOptind )
         goto usage;
 
-    memset( pTruth, 0, 64 );
+    memset( pTruth, 0, 64 * sizeof(*pTruth) );
     while ( globalUtilOptind < argc )
     {
         if ( nFunc == 16 )
diff --git a/src/base/abci/abcExact.c b/src/base/abci/abcExact.c
index b717f5b421..f1bde51ecb 100644
--- a/src/base/abci/abcExact.c
+++ b/src/base/abci/abcExact.c
@@ -388,7 +388,7 @@ static inline Ses_Store_t * Ses_StoreAlloc( int nBTLimit, int fMakeAIG, int fVer
     pStore->fMakeAIG           = fMakeAIG;
     pStore->fVerbose           = fVerbose;
     pStore->nBTLimit           = nBTLimit;
-    memset( pStore->pEntries, 0, SES_STORE_TABLE_SIZE );
+    memset( pStore->pEntries, 0, SES_STORE_TABLE_SIZE * sizeof(pStore->pEntries[0]) );
 
     pStore->pSat = sat_solver_new();
 
diff --git a/src/bdd/dsd/dsdProc.c b/src/bdd/dsd/dsdProc.c
index bcc3102cf0..8c775e8b94 100644
--- a/src/bdd/dsd/dsdProc.c
+++ b/src/bdd/dsd/dsdProc.c
@@ -873,7 +873,7 @@ if ( s_Show )
                         for ( m = 0; m < pLR->nDecs; m++ )
                             if ( pLR->pDecs[m] != pLastDiffL )
                                  pCommon[nCommon++] = pLR->pDecs[m];
-                        assert( nCommon = pLR->nDecs-1 );
+                        assert( nCommon == pLR->nDecs-1 );
                     }
                 }
                 else
diff --git a/src/proof/live/ltl_parser.c b/src/proof/live/ltl_parser.c
index 36d109ccda..646e8f48cd 100644
--- a/src/proof/live/ltl_parser.c
+++ b/src/proof/live/ltl_parser.c
@@ -519,7 +519,7 @@ void populateAigPointerUnitGF( Aig_Man_t *pAigNew, ltlNode *topASTNode, Vec_Ptr_
             return;
         case GLOBALLY:
             nextNode = topASTNode->left;
-            assert( nextNode->type = EVENTUALLY );
+            assert( nextNode->type == EVENTUALLY );
             nextToNextNode = nextNode->left;
             if( nextToNextNode->type == BOOL )
             {
diff --git a/src/proof/ssc/sscUtil.c b/src/proof/ssc/sscUtil.c
index db7f772bf9..c88e0220e2 100644
--- a/src/proof/ssc/sscUtil.c
+++ b/src/proof/ssc/sscUtil.c
@@ -96,7 +96,7 @@ Gia_Man_t * Gia_ManDropContained( Gia_Man_t * p )
             Vec_IntWriteEntry( vLits, i, ConstLit ); // const1 SAT var is always true
         else 
         {
-            assert( status = l_True );
+            assert( status == l_True );
             Vec_IntPush( vKeep, i );
         }
     }