diff --git a/src/subsidy_base.h b/src/subsidy_base.h
--- a/src/subsidy_base.h
+++ b/src/subsidy_base.h
@@ -20,7 +20,7 @@ extern SubsidyPool _subsidy_pool;
 
 /** Struct about subsidies, offered and awarded */
 struct Subsidy : SubsidyPool::PoolItem<&_subsidy_pool> {
-	CargoID cargo_type;  ///< Cargo type involved in this subsidy, CT_INVALID for invalid subsidy
+	CargoID cargo_type;  ///< Cargo type involved in this subsidy, INVALID_CARGO for invalid subsidy
 	uint16_t remaining;    ///< Remaining months when this subsidy is valid
 	CompanyID awarded;   ///< Subsidy is awarded to this company; INVALID_COMPANY if it's not awarded to anyone
 	SourceType src_type; ///< Source of subsidised path (SourceType::Industry or SourceType::Town)