diff --git a/src/base_station_base.h b/src/base_station_base.h
--- a/src/base_station_base.h
+++ b/src/base_station_base.h
@@ -103,7 +103,7 @@ struct BaseStation : StationPool::PoolIt
 	 * @param available will return false if ever the variable asked for does not exist
 	 * @return the value stored in the corresponding variable
 	 */
-	virtual uint32 GetNewGRFVariable(const struct ResolverObject *object, byte variable, byte parameter, bool *available) const = 0;
+	virtual uint32 GetNewGRFVariable(const struct ResolverObject &object, byte variable, byte parameter, bool *available) const = 0;
 
 	/**
 	 * Update the coordinated of the sign (as shown in the viewport).