diff --git a/src/dock_gui.cpp b/src/dock_gui.cpp
--- a/src/dock_gui.cpp
+++ b/src/dock_gui.cpp
@@ -451,7 +451,7 @@ public:
 		}
 	}
 
-	virtual void OnTick()
+	virtual void OnRealtimeTick(uint delta_ms)
 	{
 		CheckRedrawStationCoverage(this);
 	}