diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 3d2d29977034f2e9493a463b537a896f94d13ac9..0d5c740ae29d9a8bf7e2a28dce3d8a2bc44e4136 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -2508,7 +2508,7 @@ static u64 ioc_stat_prfill(struct seq_file *sf, struct blkg_policy_data *pd,
 		   dname, !list_empty(&iocg->active_list),
 		   iocg->active, iocg->inuse,
 		   iocg->hweight_active, iocg->hweight_inuse,
-		   atomic64_read(&ioc->vtime_rate));
+		   (unsigned long long)atomic64_read(&ioc->vtime_rate));
 
 	return 0;
 }