diff --git a/include/pthread.h b/include/pthread.h
index 984db680..0492f26a 100644
--- a/include/pthread.h
+++ b/include/pthread.h
@@ -74,6 +74,9 @@ extern "C" {
 #define PTHREAD_BARRIER_SERIAL_THREAD (-1)
 
 
+#define PTHREAD_NULL ((pthread_t)0)
+
+
 int pthread_create(pthread_t *__restrict, const pthread_attr_t *__restrict, void *(*)(void *), void *__restrict);
 int pthread_detach(pthread_t);
 _Noreturn void pthread_exit(void *);