diff -r 53f4887dadb4 -r d505eaedc35e src/types/StringDataTypeWriter.h
--- a/src/types/StringDataTypeWriter.h	Sat Aug 25 10:13:00 2018 +0200
+++ b/src/types/StringDataTypeWriter.h	Sat Aug 25 17:30:19 2018 +0200
@@ -7,13 +7,15 @@
 #include <locale>
 #include <codecvt>
 
+#include <relpipe/protocol/constants.h>
+
 #include "../DataTypeWriter.h"
-#include "../format.h"
 
 namespace relpipe {
 namespace writer {
 namespace types {
 
+using namespace relpipe::protocol;
 using namespace relpipe::writer;
 /**
  * The prototype does not recognize any encoding,