diff --git a/waypoint.h b/waypoint.h
--- a/waypoint.h
+++ b/waypoint.h
@@ -74,7 +74,6 @@ int32 RemoveTrainWaypoint(TileIndex tile
 Station *ComposeWaypointStation(TileIndex tile);
 void ShowRenameWaypointWindow(const Waypoint *cp);
 void DrawWaypointSprite(int x, int y, int image, RailType railtype);
-void UpdateWaypointSign(Waypoint *cp);
 void FixOldWaypoints(void);
 void UpdateAllWaypointSigns(void);
 void UpdateAllWaypointCustomGraphics(void);