diff --git a/userspace/libraries/LibC/include/sys/syscall.h b/userspace/libraries/LibC/include/sys/syscall.h
index b6434a97..32de461b 100644
--- a/userspace/libraries/LibC/include/sys/syscall.h
+++ b/userspace/libraries/LibC/include/sys/syscall.h
@@ -90,6 +90,7 @@ __BEGIN_DECLS
 	O(SYS_FSYNC,			fsync)			\
 	O(SYS_SYMLINKAT,		symlinkat)		\
 	O(SYS_HARDLINKAT,		hardlinkat)		\
+	O(SYS_YIELD,			yield)			\
 	O(SYS_PTHREAD_CREATE,	pthread_create)	\
 	O(SYS_PTHREAD_EXIT,		pthread_exit)	\
 	O(SYS_PTHREAD_SELF,		pthread_self)	\