diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 5b081cb..0a85085 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -482,7 +482,7 @@
 	{
 		uint32_t ur_idx;
 		struct mtd_erase_region_info *kr;
-		struct region_info_user *ur = (struct region_info_user *) argp;
+		struct region_info_user __user *ur = argp;
 
 		if (get_user(ur_idx, &(ur->regionindex)))
 			return -EFAULT;