diff --git a/src/script/api/script_road.cpp b/src/script/api/script_road.cpp
index a7979bf126..f4b2031147 100644
--- a/src/script/api/script_road.cpp
+++ b/src/script/api/script_road.cpp
@@ -378,7 +378,7 @@ static bool NormaliseTileOffset(int32 *tile)
 		return false;
 }
 
-/* static */ int32 ScriptRoad::CanBuildConnectedRoadParts(ScriptTile::Slope slope_, Array<> existing, TileIndex start_, TileIndex end_)
+/* static */ SQInteger ScriptRoad::CanBuildConnectedRoadParts(ScriptTile::Slope slope_, Array<> existing, TileIndex start_, TileIndex end_)
 {
 	::Slope slope = (::Slope)slope_;
 	int32 start = start_;
@@ -399,7 +399,7 @@ static bool NormaliseTileOffset(int32 *tile)
 	return _settings_game.construction.build_on_slopes ? LookupWithBuildOnSlopes(slope, existing, start, end) : LookupWithoutBuildOnSlopes(slope, existing, start, end);
 }
 
-/* static */ int32 ScriptRoad::CanBuildConnectedRoadPartsHere(TileIndex tile, TileIndex start, TileIndex end)
+/* static */ SQInteger ScriptRoad::CanBuildConnectedRoadPartsHere(TileIndex tile, TileIndex start, TileIndex end)
 {
 	if (!::IsValidTile(tile) || !::IsValidTile(start) || !::IsValidTile(end)) return -1;
 	if (::DistanceManhattan(tile, start) != 1 || ::DistanceManhattan(tile, end) != 1) return -1;
@@ -450,7 +450,7 @@ static bool NeighbourHasReachableRoad(::RoadType rt, TileIndex start_tile, DiagD
 	}
 }
 
-/* static */ int32 ScriptRoad::GetNeighbourRoadCount(TileIndex tile)
+/* static */ SQInteger ScriptRoad::GetNeighbourRoadCount(TileIndex tile)
 {
 	if (!::IsValidTile(tile)) return -1;
 	if (!IsRoadTypeAvailable(GetCurrentRoadType())) return -1;
@@ -625,14 +625,14 @@ static bool NeighbourHasReachableRoad(::RoadType rt, TileIndex start_tile, DiagD
 	return (RoadTramTypes)(1 << ::GetRoadTramType((::RoadType)roadtype));
 }
 
-/* static */ int32 ScriptRoad::GetMaxSpeed(RoadType road_type)
+/* static */ SQInteger ScriptRoad::GetMaxSpeed(RoadType road_type)
 {
 	if (!ScriptRoad::IsRoadTypeAvailable(road_type)) return -1;
 
 	return GetRoadTypeInfo((::RoadType)road_type)->max_speed;
 }
 
-/* static */ uint16 ScriptRoad::GetMaintenanceCostFactor(RoadType roadtype)
+/* static */ SQInteger ScriptRoad::GetMaintenanceCostFactor(RoadType roadtype)
 {
 	if (!ScriptRoad::IsRoadTypeAvailable(roadtype)) return 0;
 
diff --git a/src/script/api/script_road.hpp b/src/script/api/script_road.hpp
index a042644078..f1a90ed9e0 100644
--- a/src/script/api/script_road.hpp
+++ b/src/script/api/script_road.hpp
@@ -246,7 +246,7 @@ public:
 	 *         they are build or 2 when building the first part automatically
 	 *         builds the second part. -1 means the preconditions are not met.
 	 */
-	static int32 CanBuildConnectedRoadParts(ScriptTile::Slope slope, Array<> existing, TileIndex start, TileIndex end);
+	static SQInteger CanBuildConnectedRoadParts(ScriptTile::Slope slope, Array<> existing, TileIndex start, TileIndex end);
 
 	/**
 	 * Lookup function for building road parts independent of whether the
@@ -267,7 +267,7 @@ public:
 	 *         they are build or 2 when building the first part automatically
 	 *         builds the second part. -1 means the preconditions are not met.
 	 */
-	static int32 CanBuildConnectedRoadPartsHere(TileIndex tile, TileIndex start, TileIndex end);
+	static SQInteger CanBuildConnectedRoadPartsHere(TileIndex tile, TileIndex start, TileIndex end);
 
 	/**
 	 * Count how many neighbours are road.
@@ -276,7 +276,7 @@ public:
 	 * @pre IsRoadTypeAvailable(GetCurrentRoadType()).
 	 * @return 0 means no neighbour road; max value is 4.
 	 */
-	static int32 GetNeighbourRoadCount(TileIndex tile);
+	static SQInteger GetNeighbourRoadCount(TileIndex tile);
 
 	/**
 	 * Gets the tile in front of a road depot.
@@ -561,7 +561,7 @@ public:
 	 *       This is mph / 0.8, which is roughly 0.5 km/h.
 	 *       To get km/h multiply this number by 2.01168.
 	 */
-	static int32 GetMaxSpeed(RoadType road_type);
+	static SQInteger GetMaxSpeed(RoadType road_type);
 
 	/**
 	 * Get the maintenance cost factor of a road type.
@@ -569,7 +569,7 @@ public:
 	 * @pre IsRoadTypeAvailable(roadtype)
 	 * @return Maintenance cost factor of the roadtype.
 	 */
-	static uint16 GetMaintenanceCostFactor(RoadType roadtype);
+	static SQInteger GetMaintenanceCostFactor(RoadType roadtype);
 
 private: