diff --git a/tetrislogic/tetromino.py b/tetrislogic/tetromino.py
index 94fc169..50bd0d2 100644
--- a/tetrislogic/tetromino.py
+++ b/tetrislogic/tetromino.py
@@ -45,7 +45,7 @@ class Tetromino(list):
         self.prelocked = False
 
     def ghost(self):
-        return self.__class__()
+        return type(self)()
 
 class O(Tetromino, metaclass=MetaTetromino):