diff --git a/src/vehicle_gui.h b/src/vehicle_gui.h
--- a/src/vehicle_gui.h
+++ b/src/vehicle_gui.h
@@ -107,6 +107,7 @@ static inline WindowClass GetWindowClass
 
 /* Unified window procedure */
 void ShowVehicleViewWindow(const Vehicle *v);
+bool VehicleClicked(const Vehicle *v);
 void StartStopVehicle(const Vehicle *v, bool texteffect);
 
 Vehicle *CheckClickOnVehicle(const struct ViewPort *vp, int x, int y);