diff --git a/drivers/staging/greybus/connection.h b/drivers/staging/greybus/connection.h
index 15bdc815286d..f2588a74904a 100644
--- a/drivers/staging/greybus/connection.h
+++ b/drivers/staging/greybus/connection.h
@@ -25,6 +25,8 @@ struct gb_connection {
 
 	struct list_head		operations;
 	atomic_t			op_cycle;
+
+	void				*private;
 };
 
 struct gb_connection *gb_connection_create(struct gb_interface *interface,