diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index 5badb0c039de404b24208c8e6c2041b3331ae5bb..9a5ed30b8a354e47d4a32e62dfd3fc6246ab068f 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -389,6 +389,8 @@ static int readpage_strip(void *data, struct page *page)
 	size_t len;
 	int ret;
 
+	BUG_ON(!PageLocked(page));
+
 	/* FIXME: Just for debugging, will be removed */
 	if (PageUptodate(page))
 		EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,