diff --git a/xjiggler/xjiggler b/xjiggler/xjiggler
index 0df1023..e0c27b3 100755
--- a/xjiggler/xjiggler
+++ b/xjiggler/xjiggler
@@ -65,7 +65,8 @@ do
 	if test "$XJIGGLER_lastX" = "$XJIGGLER_X" \
 			&& test "$XJIGGLER_lastY" = "$XJIGGLER_Y"
 	then	# no movement
-		test "$(printf '%s\n%s\n-\n' "$XJIGGLER_S" "$XJIGGLER_lastS" \
+		test "$(printf '%s\n%s\n-\np\n' "$XJIGGLER_T" \
+					"$XJIGGLER_lastT" \
 				| dc)" -gt "$XJIGGLER_ACTION_DELAY" \
 			|| continue	# hasn't been long enough
 		rotatemousedirection; jiggle