diff --git a/src/ai/api/ai_road.cpp b/src/ai/api/ai_road.cpp
--- a/src/ai/api/ai_road.cpp
+++ b/src/ai/api/ai_road.cpp
@@ -471,7 +471,7 @@ static bool NeighbourHasReachableRoad(::
 	EnforcePrecondition(false, !one_way || AIObject::GetRoadType() == ::ROADTYPE_ROAD);
 	EnforcePrecondition(false, IsRoadTypeAvailable(GetCurrentRoadType()));
 
-	return AIObject::DoCommand(start, end, (::TileY(start) != ::TileY(end) ? 4 : 0) | (((start < end) == !full) ? 1 : 2) | (AIObject::GetRoadType() << 3) | ((one_way ? 1 : 0) << 5), CMD_BUILD_LONG_ROAD);
+	return AIObject::DoCommand(start, end, (::TileY(start) != ::TileY(end) ? 4 : 0) | (((start < end) == !full) ? 1 : 2) | (AIObject::GetRoadType() << 3) | ((one_way ? 1 : 0) << 5) | 1 << 6, CMD_BUILD_LONG_ROAD);
 }
 
 /* static */ bool AIRoad::BuildRoad(TileIndex start, TileIndex end)