diff --git a/dbcon/execplan/operator.cpp b/dbcon/execplan/operator.cpp
index 5f0fa770c..a2b097470 100644
--- a/dbcon/execplan/operator.cpp
+++ b/dbcon/execplan/operator.cpp
@@ -280,12 +280,12 @@ void Operator::reverseOp()
 
     case OP_NE:
       fOp = OP_EQ;
-      fData = "=";
+      fData = '=';
       break;
 
     case OP_GT:
       fOp = OP_LT;
-      fData = "<";
+      fData = '<';
       break;
 
     case OP_GE:
@@ -295,7 +295,7 @@ void Operator::reverseOp()
 
     case OP_LT:
       fOp = OP_GT;
-      fData = ">";
+      fData = '>';
       break;
 
     case OP_LE:
diff --git a/utils/funcexp/func_math.cpp b/utils/funcexp/func_math.cpp
index ce3d3542d..8992411cd 100644
--- a/utils/funcexp/func_math.cpp
+++ b/utils/funcexp/func_math.cpp
@@ -2005,7 +2005,7 @@ string Func_format::getStrVal(Row& row, FunctionParm& parm, bool& isNull,
 
   while ((comma -= 3) > end)
   {
-    value.insert(comma, ",");
+    value.insert(comma, 1, ',');
   }
 
   return value;
diff --git a/utils/funcexp/func_round.cpp b/utils/funcexp/func_round.cpp
index aa8c96ba4..3b765a916 100644
--- a/utils/funcexp/func_round.cpp
+++ b/utils/funcexp/func_round.cpp
@@ -551,7 +551,7 @@ IDB_Decimal Func_round::getDecimalVal(Row& row, FunctionParm& parm, bool& isNull
         else
         {
           if (-s >= (int32_t)value.size())
-            value = "0";
+            value = '0';
           else
           {
             // check to see if last digit needs to be rounded up
@@ -621,7 +621,7 @@ IDB_Decimal Func_round::getDecimalVal(Row& row, FunctionParm& parm, bool& isNull
         else
         {
           if (-s >= (int32_t)value.size())
-            value = "0";
+            value = '0';
           else
           {
             // check to see if last digit needs to be rounded up