diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 017ce60..00b3acc 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -273,7 +273,7 @@
 				map->vma->vm_start + map->notify.addr;
 			err = copy_to_user(tmp, &err, 1);
 			if (err)
-				return err;
+				return -EFAULT;
 			map->notify.flags &= ~UNMAP_NOTIFY_CLEAR_BYTE;
 		} else if (pgno >= offset && pgno < offset + pages) {
 			uint8_t *tmp = kmap(map->pages[pgno]);