diff -r 733334eca89b -r 8fd6c4d44071 src/types/StringDataTypeWriter.h
--- a/src/types/StringDataTypeWriter.h	Sun Jul 22 00:08:13 2018 +0200
+++ b/src/types/StringDataTypeWriter.h	Sun Jul 22 10:26:22 2018 +0200
@@ -26,7 +26,7 @@
 	std::wstring_convert<std::codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
 public:
 
-	StringDataTypeWriter() : DataTypeWriter<string_t>(DATA_TYPE_ID_STRING, DATA_TYPE_CODE_STRING) {
+	StringDataTypeWriter() : DataTypeWriter<string_t>(TypeId::STRING, DATA_TYPE_CODE_STRING) {
 	}
 
 	void writeValue(std::ostream &output, const string_t &value) override {