diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3853023..8e26c90 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -644,6 +644,7 @@
 struct sched_domain {
 	/* These fields must be setup */
 	struct sched_domain *parent;	/* top domain must be null terminated */
+	struct sched_domain *child;	/* bottom domain must be null terminated */
 	struct sched_group *groups;	/* the balancing groups of the domain */
 	cpumask_t span;			/* span of all CPUs in this domain */
 	unsigned long min_interval;	/* Minimum balance interval ms */