diff --git a/fs/block_dev.c b/fs/block_dev.c
index 17c7618..af88c43 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1087,7 +1087,7 @@
 	.direct_IO	= blkdev_direct_IO,
 };
 
-struct file_operations def_blk_fops = {
+const struct file_operations def_blk_fops = {
 	.open		= blkdev_open,
 	.release	= blkdev_close,
 	.llseek		= block_llseek,