diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 695b0cc..c668f36 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -97,7 +97,7 @@
 	u64 dirty_bytes;
 	int track_uptodate;
 	spinlock_t lock;
-	struct extent_io_ops *ops;
+	const struct extent_io_ops *ops;
 };
 
 struct extent_state {