diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index ea55b6c..64a96cd 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -106,7 +106,7 @@
 	return 0;
 }
 
-static struct super_operations isofs_sops = {
+static const struct super_operations isofs_sops = {
 	.alloc_inode	= isofs_alloc_inode,
 	.destroy_inode	= isofs_destroy_inode,
 	.read_inode	= isofs_read_inode,