diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 0eabe73c964d..25b248a02507 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -615,7 +615,7 @@ static int ubd_open_dev(struct ubd *ubd_dev)
 		blk_queue_max_sectors(ubd_dev->queue, 8 * sizeof(long));
 
 		err = -ENOMEM;
-		ubd_dev->cow.bitmap = (void *) vmalloc(ubd_dev->cow.bitmap_len);
+		ubd_dev->cow.bitmap = vmalloc(ubd_dev->cow.bitmap_len);
 		if(ubd_dev->cow.bitmap == NULL){
 			printk(KERN_ERR "Failed to vmalloc COW bitmap\n");
 			goto error;