diff --git a/src/station_base.h b/src/station_base.h
--- a/src/station_base.h
+++ b/src/station_base.h
@@ -334,6 +334,8 @@ public:
 	/* virtual */ uint32 GetNewGRFVariable(const ResolverObject *object, byte variable, byte parameter, bool *available) const;
 
 	/* virtual */ void GetTileArea(TileArea *ta, StationType type) const;
+
+	void RunAverages();
 };
 
 #define FOR_ALL_STATIONS(var) FOR_ALL_BASE_STATIONS_OF_TYPE(Station, var)