diff --git a/src/pathfinder/pathfinder_type.h b/src/pathfinder/pathfinder_type.h
--- a/src/pathfinder/pathfinder_type.h
+++ b/src/pathfinder/pathfinder_type.h
@@ -39,9 +39,6 @@ static const int YAPF_TILE_CORNER_LENGTH
  */
 static const int YAPF_INFINITE_PENALTY = 1000 * YAPF_TILE_LENGTH;
 
-/** Maximum length of ship path cache */
-static const int YAPF_SHIP_PATH_CACHE_LENGTH = 32;
-
 /** Maximum segments of road vehicle path cache */
 static const int YAPF_ROADVEH_PATH_CACHE_SEGMENTS = 8;