diff --git a/fs/isofs/compress.c b/fs/isofs/compress.c
index 4917315..3a39158 100644
--- a/fs/isofs/compress.c
+++ b/fs/isofs/compress.c
@@ -312,7 +312,7 @@
 	return err;
 }
 
-struct address_space_operations zisofs_aops = {
+const struct address_space_operations zisofs_aops = {
 	.readpage = zisofs_readpage,
 	/* No sync_page operation supported? */
 	/* No bmap operation supported */