diff --git a/dbcon/execplan/operator.cpp b/dbcon/execplan/operator.cpp
index de5101c4d..ef952e0ac 100644
--- a/dbcon/execplan/operator.cpp
+++ b/dbcon/execplan/operator.cpp
@@ -271,12 +271,12 @@ void Operator::reverseOp()
 
     case OP_NE:
       fOp = OP_EQ;
-      fData = "=";
+      fData = '=';
       break;
 
     case OP_GT:
       fOp = OP_LT;
-      fData = "<";
+      fData = '<';
       break;
 
     case OP_GE:
@@ -286,7 +286,7 @@ 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 7ef56be70..8753991cd 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 9f265f961..967e64f38 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