diff --git a/tetris/rulesets/tetra.lua b/tetris/rulesets/tetra.lua
index 1b281ca..0f7e616 100644
--- a/tetris/rulesets/tetra.lua
+++ b/tetris/rulesets/tetra.lua
@@ -99,7 +99,7 @@ end
 function Tetra:onPieceCreate(piece) piece.lowest_y = -math.huge end
 function Tetra:onPieceDrop(piece) self:checkNewLow(piece) end
 function Tetra:onPieceMove() end
-function Tetra:onPieceRotate() self:checkNewLow(piece) end
+function Tetra:onPieceRotate(piece) self:checkNewLow(piece) end
 function Tetra:canPieceRotate() return true end
 function Tetra:get180RotationValue() return 2 end