diff --git a/src/game/tetromino/placing.c b/src/game/tetromino/placing.c
index 45553f9..b796a5d 100644
--- a/src/game/tetromino/placing.c
+++ b/src/game/tetromino/placing.c
@@ -120,6 +120,6 @@ void place_update(struct gamedata* gdat, int movdat) {
 	gdat->pdat.sel[0] += (tmp && shape_intersects(gdat->rows, id, gdat->pdat.sel + (i8vec2){tmp, 0})) * tmp;
 
 	// update roll
-	tmp = id - (((!!(movdat & MOVRL) - !!(movdat & MOVRR)) * 8 + id) & 31);
-	gdat->pdat.nxt[idx] += (tmp && shape_intersects(gdat->rows, tmp, gdat->pdat.sel)) * tmp;
+	tmp = id ^ (((!!(movdat & MOVRL) - !!(movdat & MOVRR)) * 8 + id) & 31);
+	gdat->pdat.nxt[idx] ^= (tmp && shape_intersects(gdat->rows, id ^ tmp, gdat->pdat.sel)) * tmp;
 }