diff --git a/kernel-src/include/mutex.h b/kernel-src/include/mutex.h
index bf8aac65..38d033c4 100644
--- a/kernel-src/include/mutex.h
+++ b/kernel-src/include/mutex.h
@@ -11,6 +11,9 @@ typedef semaphore_t mutex_t;
 #define MUTEX_ACQUIRE(m, i) \
 	semaphore_wait(m, i)
 
+#define MUTEX_ACQUIRE_TIMED(m, t, i) \
+	semaphore_timedwait(m, t, i)
+
 #define MUTEX_RELEASE(m) \
 	semaphore_signal(m)