diff --git a/include/linux/sched.h b/include/linux/sched.h
index 2acfb23f3681f51ffd28ec182d947249df87d8e5..7e74262f98e1ff577931a2bd4eab9d99299c1ea1 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -34,6 +34,8 @@
 #define SCHED_FIFO		1
 #define SCHED_RR		2
 #define SCHED_BATCH		3
+/* SCHED_ISO: reserved but not implemented yet */
+#define SCHED_IDLE		5
 
 #ifdef __KERNEL__