diff --git a/mm/workingset.c b/mm/workingset.c
index e9f05634747a..dad8b16af105 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -266,13 +266,14 @@ static bool lru_gen_test_recent(void *shadow, struct lruvec **lruvec,
 {
 	int memcg_id;
 	unsigned long max_seq;
-	struct mem_cgroup *memcg;
+	struct mem_cgroup *memcg, *effective_memcg;
 	struct pglist_data *pgdat;
 
 	unpack_shadow(shadow, &memcg_id, &pgdat, token, workingset);
 
 	memcg = mem_cgroup_from_id(memcg_id);
-	*lruvec = mem_cgroup_lruvec(memcg, pgdat);
+	effective_memcg = memcg ? : root_mem_cgroup;
+	*lruvec = mem_cgroup_lruvec(effective_memcg, pgdat);
 
 	max_seq = READ_ONCE((*lruvec)->lrugen.max_seq);
 	max_seq &= EVICTION_MASK >> LRU_REFS_WIDTH;