diff --git a/src/tunnelbridge_cmd.cpp b/src/tunnelbridge_cmd.cpp
--- a/src/tunnelbridge_cmd.cpp
+++ b/src/tunnelbridge_cmd.cpp
@@ -504,7 +504,6 @@ CommandCost CmdBuildTunnel(TileIndex sta
 
 		cost.AddCost(_price.build_tunnel);
 		cost.AddCost(cost.GetCost() >> 3); // add a multiplier for longer tunnels
-		if (cost.GetCost() >= 400000000) cost.AddCost(400000000 - cost.GetCost());
 	}
 
 	/* Add the cost of the entrance */