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-rw-r--r--src/subsidy.cpp2
-rw-r--r--src/subsidy_func.h2
2 files changed, 2 insertions, 2 deletions
diff --git a/src/subsidy.cpp b/src/subsidy.cpp
index 2ee28c720..12fc73682 100644
--- a/src/subsidy.cpp
+++ b/src/subsidy.cpp
@@ -286,7 +286,7 @@ no_add:;
InvalidateWindow(WC_SUBSIDIES_LIST, 0);
}
-bool CheckSubsidised(Station *from, Station *to, CargoID cargo_type)
+bool CheckSubsidised(const Station *from, const Station *to, CargoID cargo_type)
{
Subsidy *s;
TileIndex xy;
diff --git a/src/subsidy_func.h b/src/subsidy_func.h
index 608dadfed..063c59233 100644
--- a/src/subsidy_func.h
+++ b/src/subsidy_func.h
@@ -16,7 +16,7 @@ Pair SetupSubsidyDecodeParam(const Subsidy *s, bool mode);
void DeleteSubsidyWithTown(TownID index);
void DeleteSubsidyWithIndustry(IndustryID index);
void DeleteSubsidyWithStation(StationID index);
-bool CheckSubsidised(Station *from, Station *to, CargoID cargo_type);
+bool CheckSubsidised(const Station *from, const Station *to, CargoID cargo_type);
void SubsidyMonthlyHandler();
#endif /* SUBSIDY_FUNC_H */