diff --git a/src/ai/default/default.h b/src/ai/default/default.h
deleted file mode 100644
--- a/src/ai/default/default.h
+++ /dev/null
@@ -1,69 +0,0 @@
-/* $Id$ */
-
-/** @file default.h The original AI. */
-
-#ifndef DEFAULT_H
-#define DEFAULT_H
-
-#include "../../direction_type.h"
-#include "../../vehicle_type.h"
-#include "../../rail_type.h"
-
-void AiDoGameLoop(Company *c);
-
-struct AiBuildRec {
-	TileIndex spec_tile;
-	TileIndex use_tile;
-	byte rand_rng;
-	byte cur_building_rule;
-	byte unk6;
-	byte unk7;
-	byte buildcmd_a;
-	byte buildcmd_b;
-	byte direction;
-	CargoID cargo;
-};
-
-struct CompanyAI {
-	byte state;
-	byte tick;            ///< Used to determine how often to move
-	uint32 state_counter; ///< Can hold tile index!
-	uint16 timeout_counter;
-
-	byte state_mode;
-	byte banned_tile_count;
-	RailTypeByte railtype_to_use;
-
-	CargoID cargo_type;
-	byte num_wagons;
-	byte build_kind;
-	byte num_build_rec;
-	byte num_loco_to_build;
-	byte num_want_fullload;
-
-	byte route_type_mask;
-
-	TileIndex start_tile_a;
-	TileIndex cur_tile_a;
-	DiagDirectionByte cur_dir_a;
-	DiagDirectionByte start_dir_a;
-
-	TileIndex start_tile_b;
-	TileIndex cur_tile_b;
-	DiagDirectionByte cur_dir_b;
-	DiagDirectionByte start_dir_b;
-
-	Vehicle *cur_veh; ///< only used by some states
-
-	AiBuildRec src, dst, mid1, mid2;
-
-	VehicleID wagon_list[9];
-	byte order_list_blocks[20];
-
-	TileIndex banned_tiles[16];
-	byte banned_val[16];
-};
-
-extern CompanyAI _companies_ai[MAX_COMPANIES];
-
-#endif