diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 19a09a187270..beab6d2643cb 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1187,7 +1187,7 @@ struct compat_loop_info {
  * - noinlined to reduce stack space usage in main part of driver
  */
 static noinline int
-loop_info64_from_compat(const struct compat_loop_info *arg,
+loop_info64_from_compat(const struct compat_loop_info __user *arg,
 			struct loop_info64 *info64)
 {
 	struct compat_loop_info info;