diff --git a/src/libraries/turtle/is_functor.hpp b/src/libraries/turtle/is_functor.hpp
index 83dac59..acf5f40 100644
--- a/src/libraries/turtle/is_functor.hpp
+++ b/src/libraries/turtle/is_functor.hpp
@@ -12,8 +12,6 @@
 
 #include "yes_no_type.hpp"
 #include <boost/function_types/is_callable_builtin.hpp>
-#include <boost/type_traits/integral_constant.hpp>
-#include <boost/type_traits/detail/yes_no_type.hpp>
 #include <boost/mpl/bool.hpp>
 #include <boost/mpl/or.hpp>