diff --git a/parts/modes/tsd_u.lua b/parts/modes/tsd_u.lua
index 24c08ddd..fc93961d 100644
--- a/parts/modes/tsd_u.lua
+++ b/parts/modes/tsd_u.lua
@@ -3,11 +3,11 @@ local function check_tsd(P)
 	local C=P.lastPiece
 	if C.row>0 then
 		if C.id==5 and C.row==2 and C.spin then
-			P.modeData.tsd=P.modeData.tsd+1
 			if TABLE.find(P.modeData.history,C.centX)then
 				P:showText("STACK",0,-140,40,'flicker',.3)
 				P:lose()
 			else
+				P.modeData.tsd=P.modeData.tsd+1
 				table.insert(P.modeData.history,1,C.centX)
 				P.modeData.history[5]=nil
 			end