diff --git a/include/pthread.h b/include/pthread.h
index 05616a54c64..639badd12f1 100644
--- a/include/pthread.h
+++ b/include/pthread.h
@@ -525,7 +525,8 @@ void pthread_yield(void);
 
 /* A thread may obtain a copy of its own thread handle. */
 
-#define pthread_self() ((pthread_t)gettid())
+#define pthread_self()            ((pthread_t)gettid())
+#define pthread_gettid_np(thread) ((pid_t)(thread))
 
 /* Compare two thread IDs. */