--- data/xsession/openbox-gnome-session.in.orig	2013-09-08 07:16:28.000000000 +0400
+++ data/xsession/openbox-gnome-session.in	2013-09-08 07:17:08.000000000 +0400
@@ -13,7 +13,7 @@
       -remove _NET_CURRENT_DESKTOP 2> /dev/null
 
 VER=$(gnome-session --version 2>/dev/null | \
-      sed -e 's/[^0-9.]*\([0-9.]\+\)/\1/')
+      awk '{ print $2 }')
 
 MAJOR=$(echo $VER | cut -d . -f 1)
 MINOR=$(echo $VER | cut -d . -f 2)