diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 26948a6..3f8af0f 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -310,7 +310,7 @@
 	Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode,
 };
 
-static match_table_t tokens = {
+static const match_table_t tokens = {
 	{Opt_norock, "norock"},
 	{Opt_nojoliet, "nojoliet"},
 	{Opt_unhide, "unhide"},