diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index ad843eb..06bd635 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1308,7 +1308,7 @@ static struct attribute *port_sysfs_entries[] = {
 	NULL
 };
 
-static struct attribute_group port_attribute_group = {
+static const struct attribute_group port_attribute_group = {
 	.name = NULL,		/* put in device directory */
 	.attrs = port_sysfs_entries,
 };