diff --git a/include/turtle/detail/mutex.hpp b/include/turtle/detail/mutex.hpp
index 6bb6e1e..9702db6 100644
--- a/include/turtle/detail/mutex.hpp
+++ b/include/turtle/detail/mutex.hpp
@@ -10,7 +10,7 @@
 #define MOCK_MUTEX_HPP_INCLUDED
 
 #include "../config.hpp"
-#include <boost/test/utils/trivial_singleton.hpp>
+#include <turtle/detail/singleton.hpp>
 #include <boost/shared_ptr.hpp>
 
 #ifdef MOCK_THREAD_SAFE