diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a34d9fc..f2c56a1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3372,7 +3372,7 @@
 	for_each_zone_zonelist_nodemask(zone, z, ac->zonelist,
 					ac->high_zoneidx, ac->nodemask) {
 		if (last_pgdat != zone->zone_pgdat)
-			wakeup_kswapd(zone, order, ac_classzone_idx(ac));
+			wakeup_kswapd(zone, order, ac->high_zoneidx);
 		last_pgdat = zone->zone_pgdat;
 	}
 }