diff --git a/src/autoreplace_cmd.cpp b/src/autoreplace_cmd.cpp
--- a/src/autoreplace_cmd.cpp
+++ b/src/autoreplace_cmd.cpp
@@ -37,8 +37,8 @@ extern void ChangeVehicleViewWindow(Vehi
  */
 static bool EnginesHaveCargoInCommon(EngineID engine_a, EngineID engine_b)
 {
-	uint32 available_cargoes_a = GetUnionOfArticulatedRefitMasks(engine_a, true);
-	uint32 available_cargoes_b = GetUnionOfArticulatedRefitMasks(engine_b, true);
+	CargoTypes available_cargoes_a = GetUnionOfArticulatedRefitMasks(engine_a, true);
+	CargoTypes available_cargoes_b = GetUnionOfArticulatedRefitMasks(engine_b, true);
 	return (available_cargoes_a == 0 || available_cargoes_b == 0 || (available_cargoes_a & available_cargoes_b) != 0);
 }
 
@@ -173,9 +173,8 @@ static void TransferCargo(Vehicle *old_v
  */
 static bool VerifyAutoreplaceRefitForOrders(const Vehicle *v, EngineID engine_type)
 {
-
-	uint32 union_refit_mask_a = GetUnionOfArticulatedRefitMasks(v->engine_type, false);
-	uint32 union_refit_mask_b = GetUnionOfArticulatedRefitMasks(engine_type, false);
+	CargoTypes union_refit_mask_a = GetUnionOfArticulatedRefitMasks(v->engine_type, false);
+	CargoTypes union_refit_mask_b = GetUnionOfArticulatedRefitMasks(engine_type, false);
 
 	const Order *o;
 	const Vehicle *u = (v->type == VEH_TRAIN) ? v->First() : v;
@@ -201,7 +200,7 @@ static bool VerifyAutoreplaceRefitForOrd
  */
 static CargoID GetNewCargoTypeForReplace(Vehicle *v, EngineID engine_type, bool part_of_chain)
 {
-	uint32 available_cargo_types, union_mask;
+	CargoTypes available_cargo_types, union_mask;
 	GetArticulatedRefitMasks(engine_type, true, &union_mask, &available_cargo_types);
 
 	if (union_mask == 0) return CT_NO_REFIT; // Don't try to refit an engine with no cargo capacity