diff --git a/src/lib.rs b/src/lib.rs
index 32f5807..46c4475 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -250,10 +250,10 @@ impl State {
 
     fn move_dir(&mut self, dir: Direction) -> Result<(bool, bool)> {
         match dir {
-            Direction::U => self.move_pos(Pos(0, -1)),
-            Direction::D => self.move_pos(Pos(0, 1)),
-            Direction::L => self.move_pos(Pos(-1, 0)),
-            Direction::R => self.move_pos(Pos(1, 0)),
+            Direction::U => self.move_pos(Self::DIR_POS[0]),
+            Direction::D => self.move_pos(Self::DIR_POS[1]),
+            Direction::L => self.move_pos(Self::DIR_POS[2]),
+            Direction::R => self.move_pos(Self::DIR_POS[3]),
         }
     }