diff --git a/src/subsidy_func.h b/src/subsidy_func.h
--- a/src/subsidy_func.h
+++ b/src/subsidy_func.h
@@ -13,7 +13,9 @@
 
 Pair SetupSubsidyDecodeParam(const struct Subsidy *s, bool mode);
 void DeleteSubsidyWith(SourceType type, SourceID index);
-bool CheckSubsidised(const Station *from, const Station *to, CargoID cargo_type, CompanyID company);
+bool CheckSubsidised(CargoID cargo_type, CompanyID company, SourceType src_type, SourceID src, const Station *st);
 void SubsidyMonthlyHandler();
+void RebuildSubsidisedSourceAndDestinationCache();
+void DeleteSubsidy(struct Subsidy *s);
 
 #endif /* SUBSIDY_FUNC_H */