diff --git a/bin/input-event b/bin/input-event
index 459f4d1..47c9444 100755
--- a/bin/input-event
+++ b/bin/input-event
@@ -51,7 +51,17 @@ case "$use,$(uname -n),$name" in
         # The following is 60% 0 0 0 40% 60% 0 0
         # The logic is explained here:
         #  http://who-t.blogspot.de/2013/12/lenovo-t440-touchpad-button.html
-        xinput set-prop $device 'Synaptics Soft Button Areas' 3656 0 0 0 2928 3656 0 0
+        xstart=1472
+        xend=5112
+        xinput set-prop $device 'Synaptics Soft Button Areas' \
+               $(( ($xend - $xstart) * 60 / 100 + $xstart )) \
+               0 \
+               0 \
+               0 \
+               $(( ($xend - $xstart) * 40 / 100 + $xstart )) \
+               $(( ($xend - $xstart) * 60 / 100 + $xstart )) \
+               0 \
+               0
         xinput set-prop $device 'Synaptics Off' 1
         ;;
     XISlavePointer,zoro,"ELAN Touchscreen")