diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 9778259b30d4..a5104cf96609 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -247,8 +247,7 @@ MODULE_ALIAS("rd");
 /* Legacy boot options - nonmodular */
 static int __init ramdisk_size(char *str)
 {
-	rd_size = simple_strtol(str, NULL, 0);
-	return 1;
+	return kstrtoul(str, 0, &rd_size) == 0;
 }
 __setup("ramdisk_size=", ramdisk_size);
 #endif