diff --git a/Drivers/NpgsqlDriver.cs b/Drivers/NpgsqlDriver.cs
index 9061a906..409d7570 100644
--- a/Drivers/NpgsqlDriver.cs
+++ b/Drivers/NpgsqlDriver.cs
@@ -608,11 +608,10 @@ string AddRowsToCopyCommand()
         {
             return (el, notNull, isDapper) =>
             {
-                var enumToStringStmt = $"{el}.Value.Stringify()";
                 var nullValue = isDapper ? "null" : "(object)DBNull.Value";
                 return notNull
-                    ? enumToStringStmt
-                    : $"{el} != null ? {enumToStringStmt} : {nullValue}";
+                    ? $"{el}.Stringify()"
+                    : $"{el} != null ? {el}.Value.Stringify() : {nullValue}";
             };
         }