diff --git a/lib/cpp/src/concurrency/Mutex.h b/lib/cpp/src/concurrency/Mutex.h
index 7830d68..3b8631b 100644
--- a/lib/cpp/src/concurrency/Mutex.h
+++ b/lib/cpp/src/concurrency/Mutex.h
@@ -28,12 +28,8 @@
   virtual void unlock() const;
 
   static void DEFAULT_INITIALIZER(void*);
-#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
   static void ADAPTIVE_INITIALIZER(void*);
-#endif
-#ifdef PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
   static void RECURSIVE_INITIALIZER(void*);
-#endif
 
  private: