diff --git a/tetris/rulesets/standard_exp.lua b/tetris/rulesets/standard_exp.lua
index 029dc85..42b6a43 100755
--- a/tetris/rulesets/standard_exp.lua
+++ b/tetris/rulesets/standard_exp.lua
@@ -53,4 +53,6 @@ function SRS:onPieceRotate(piece, grid)
 	end
 end
 
+function SRS:get180RotationValue() return 2 end
+
 return SRS