diff --git a/src/ship_cmd.cpp b/src/ship_cmd.cpp
--- a/src/ship_cmd.cpp
+++ b/src/ship_cmd.cpp
@@ -501,10 +501,9 @@ static Track ChooseShipTrack(Ship *v, Ti
  * Get the available water tracks on a tile for a ship entering a tile.
  * @param tile The tile about to enter.
  * @param dir The entry direction.
- * @param trackdir The trackdir the ship has on the old tile.
  * @return The available trackbits on the next tile.
  */
-static inline TrackBits GetAvailShipTracks(TileIndex tile, DiagDirection dir, Trackdir trackdir)
+static inline TrackBits GetAvailShipTracks(TileIndex tile, DiagDirection dir)
 {
 	TrackBits tracks = GetTileShipTrackStatus(tile) & DiagdirReachesTracks(dir);
 
@@ -715,7 +714,7 @@ static void ShipController(Ship *v)
 
 			DiagDirection diagdir = DiagdirBetweenTiles(gp.old_tile, gp.new_tile);
 			assert(diagdir != INVALID_DIAGDIR);
-			tracks = GetAvailShipTracks(gp.new_tile, diagdir, v->GetVehicleTrackdir());
+			tracks = GetAvailShipTracks(gp.new_tile, diagdir);
 			if (tracks == TRACK_BIT_NONE) goto reverse_direction;
 
 			/* Choose a direction, and continue if we find one */