diff --git a/maps/territorial_control.lua b/maps/territorial_control.lua
index ab60e4c0..1b77765b 100644
--- a/maps/territorial_control.lua
+++ b/maps/territorial_control.lua
@@ -445,7 +445,7 @@ end
 
 local function on_player_changed_position(event)
 	local player = game.players[event.player_index]
-	if player.surface.index == 4 then
+	if player.surface.name == "territorial_control" then
 		uncover_map_for_player(player)
 	end
 end