diff --git a/lib/cpp/src/concurrency/Thread.h b/lib/cpp/src/concurrency/Thread.h
index 654778c..dc3c748 100755
--- a/lib/cpp/src/concurrency/Thread.h
+++ b/lib/cpp/src/concurrency/Thread.h
@@ -88,7 +88,7 @@
 #else
   typedef uint64_t id_t;
   static inline bool is_current(pthread_t t) { return pthread_equal(pthread_self(), t); }
-  static inline id_t get_current() { return pthread_self(); }
+  static inline id_t get_current() { return (Thread::id_t)pthread_self(); }
 #endif
 
   virtual ~Thread() {};