diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 6cecba8e4fe0ffdb8bb55cec18aa89577c274d84..3d2d29977034f2e9493a463b537a896f94d13ac9 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -2524,7 +2524,7 @@ static int ioc_cost_print_stat(struct seq_file *sf, void *v)
 
 static struct cftype ioc_files[] = {
 	{
-		.name = "weight",
+		.name = "cost.weight",
 		.flags = CFTYPE_NOT_ON_ROOT,
 		.seq_show = ioc_weight_show,
 		.write = ioc_weight_write,