diff --git a/src/newgrf_canal.h b/src/newgrf_canal.h
--- a/src/newgrf_canal.h
+++ b/src/newgrf_canal.h
@@ -58,7 +58,6 @@ extern WaterFeature _water_feature[CF_EN
  */
 SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile);
 
-uint16 GetCanalCallback(CallbackID callback, uint32 param1, uint32 param2, CanalFeature feature, TileIndex tile);
 uint GetCanalSpriteOffset(CanalFeature feature, TileIndex tile, uint cur_offset);
 
 #endif /* NEWGRF_CANAL_H */