diff --git a/src/group.h b/src/group.h
--- a/src/group.h
+++ b/src/group.h
@@ -62,13 +62,17 @@ struct GroupStatistics {
 	static void UpdateAutoreplace(CompanyID company);
 };
 
+enum GroupFlags : uint8 {
+	GF_REPLACE_PROTECTION, ///< If set to true, the global autoreplace has no effect on the group
+};
+
 /** Group data. */
 struct Group : GroupPool::PoolItem<&_group_pool> {
 	std::string name;           ///< Group Name
 	Owner owner;                ///< Group Owner
 	VehicleType vehicle_type;   ///< Vehicle type of the group
 
-	bool replace_protection;    ///< If set to true, the global autoreplace have no effect on the group
+	uint8 flags;                ///< Group flags
 	Livery livery;              ///< Custom colour scheme for vehicles in this group
 	GroupStatistics statistics; ///< NOSAVE: Statistics and caches on the vehicles in the group.