diff --git a/alib2str/src/alphabet/string/RankedSymbol.cpp b/alib2str/src/alphabet/string/RankedSymbol.cpp
index 23d3505064f7f9af73352db9f3854a92bb0a5925..7a7bbc36c791bbe2f14680f6ae10277eb49b73c4 100644
--- a/alib2str/src/alphabet/string/RankedSymbol.cpp
+++ b/alib2str/src/alphabet/string/RankedSymbol.cpp
@@ -7,6 +7,7 @@
 
 #include "RankedSymbol.h"
 #include <object/Object.h>
+#include <object/string/AnyObject.h>
 #include <alphabet/Symbol.h>
 
 #include <registration/StringRegistration.hpp>
@@ -16,4 +17,6 @@ namespace {
 static auto stringWrite = registration::StringWriterRegister < alphabet::Symbol, alphabet::RankedSymbol < > > ( );
 static auto stringWrite2 = registration::StringWriterRegister < object::Object, alphabet::RankedSymbol < > > ( );
 
+static auto stringWrite3 = registration::StringWriterRegister < object::Object, object::AnyObject < common::ranked_symbol < > > > ( );
+
 } /* namespace */