diff --git a/tetris.py b/tetris.py
index 77b1b0b..8cdc8cc 100755
--- a/tetris.py
+++ b/tetris.py
@@ -314,6 +314,7 @@ class Game:
 
         self.tetrad = self.tetrad_next.centered(self.board.grid_dims[0])
         self.tetrad_next = Tetrad.random()
+        self.tetrad_preview = None
 
         if not self.try_placement(self.tetrad):
             self.end_game()