diff --git a/tetrislogic/tetrislogic.py b/tetrislogic/tetrislogic.py
index 4626b16..c1357b1 100644
--- a/tetrislogic/tetrislogic.py
+++ b/tetrislogic/tetrislogic.py
@@ -262,7 +262,7 @@ class TetrisLogic:
 
     def rotate(self, spin):
         rotated_coords = tuple(
-            Coord(spin * mino.coord.y, -spin * mino.coord.x)
+            mino.coord.rotate(spin)
             for mino in self.matrix.piece
         )
         for rotation_point, liberty_degree in enumerate(
diff --git a/tetrislogic/utils.py b/tetrislogic/utils.py
index 1a5309c..e532eea 100644
--- a/tetrislogic/utils.py
+++ b/tetrislogic/utils.py
@@ -7,6 +7,9 @@ class Coord:
     def __add__(self, other):
         return Coord(self.x + other.x, self.y + other.y)
 
+    def rotate(self, spin):
+        return Coord(spin * self.y, -spin * self.x)
+
 
 class Movement: