diff --git a/src/group_cmd.cpp b/src/group_cmd.cpp
index 8226b795c1..1042859220 100644
--- a/src/group_cmd.cpp
+++ b/src/group_cmd.cpp
@@ -596,7 +596,7 @@ CommandCost CmdAddVehicleGroup(TileIndex tile, DoCommandFlag flags, uint32 p1, u
 
 	if (new_g == NEW_GROUP) {
 		/* Create new group. */
-		CommandCost ret = CmdCreateGroup(0, flags, v->type, 0, nullptr);
+		CommandCost ret = CmdCreateGroup(0, flags, v->type, INVALID_GROUP, nullptr);
 		if (ret.Failed()) return ret;
 
 		new_g = _new_group_id;