diff --git a/include/linux/swap.h b/include/linux/swap.h
index 622025ac1461e1d58b8961a1c72df66ecf60efb6..649529be91f2114af9ed955e217d29a1ec6d9e8c 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -625,7 +625,7 @@ static inline int mem_cgroup_swappiness(struct mem_cgroup *memcg)
 		return vm_swappiness;
 
 	/* root ? */
-	if (mem_cgroup_disabled() || !memcg->css.parent)
+	if (mem_cgroup_disabled() || mem_cgroup_is_root(memcg))
 		return vm_swappiness;
 
 	return memcg->swappiness;