diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 76e12f3482a9..721bb6f9cf5b 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -234,7 +234,7 @@ static void __loop_update_dio(struct loop_device *lo, bool dio)
  * @bsize: size to validate
  */
 static int
-loop_validate_block_size(unsigned short bsize)
+loop_validate_block_size(unsigned long bsize)
 {
 	if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
 		return -EINVAL;