diff --git a/reading_machine/include/Config.hpp b/reading_machine/include/Config.hpp
index 5a5e72e24efe8cb7cf90a5de0a16394f93ebabcd..dbd49e96c16f7c8e3ae6a453480074f470323704 100644
--- a/reading_machine/include/Config.hpp
+++ b/reading_machine/include/Config.hpp
@@ -17,8 +17,8 @@ class Config
   public :
 
   static constexpr const char * EOSColName = "EOS";
-  static constexpr const char * EOSSymbol1 = "1";
-  static constexpr const char * EOSSymbol0 = "0";
+  static constexpr const char * EOSSymbol1 = "true";
+  static constexpr const char * EOSSymbol0 = "false";
   static constexpr const char * headColName = "HEAD";
   static constexpr const char * deprelColName = "DEPREL";
   static constexpr const char * idColName = "ID";