diff --git a/klient/play.py b/klient/play.py
index 4c68f0c..0fef742 100755
--- a/klient/play.py
+++ b/klient/play.py
@@ -14,16 +14,15 @@ class Action(enum.Enum):
     RIGHT = enum.auto()
     STAY = enum.auto()
 
-    _inversions = {
-        UP: DOWN,
-        DOWN: UP,
-        LEFT: RIGHT,
-        RIGHT: LEFT,
-        STAY: STAY,
-    }
-
     def invert(self) -> Action:
-        return self._inversions[self]
+        INVERSIONS = {
+            Action.UP: Action.DOWN,
+            Action.DOWN: Action.UP,
+            Action.LEFT: Action.RIGHT,
+            Action.RIGHT: Action.LEFT,
+            Action.STAY: Action.STAY,
+        }
+        return INVERSIONS[self]
 
     def __str__(self) -> str:
         return self.name.lower()