diff --git a/drivers/serial/crisv10.c b/drivers/serial/crisv10.c
index cabd048..9851d9e 100644
--- a/drivers/serial/crisv10.c
+++ b/drivers/serial/crisv10.c
@@ -4825,7 +4825,7 @@
 
 /* rs_init inits the driver at boot (using the module_init chain) */
 
-static struct tty_operations rs_ops = {
+static const struct tty_operations rs_ops = {
 	.open = rs_open,
 	.close = rs_close,
 	.write = rs_write,