diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 37aef88ec6b1..b3c5653e1dca 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -190,11 +190,6 @@ struct task_group {
 #define MAX_SHARES	(1UL << 18)
 #endif
 
-/* Default task group.
- *	Every task in system belong to this group at bootup.
- */
-extern struct task_group root_task_group;
-
 typedef int (*tg_visitor)(struct task_group *, void *);
 
 extern int walk_tg_tree_from(struct task_group *from,