--- a/python/mozboot/mozboot/debian.py
+++ b/python/mozboot/mozboot/debian.py
@@ -50,22 +50,23 @@ class DebianBootstrapper(StyloInstall, B
     # These are common packages for building Firefox for Desktop
     # (browser) for all Debian-derived distros (such as Ubuntu).
     BROWSER_COMMON_PACKAGES = [
         'libasound2-dev',
         'libcurl4-openssl-dev',
         'libdbus-1-dev',
         'libdbus-glib-1-dev',
         'libgconf2-dev',
+        'libgtk2.0-dev',
         'libgtk-3-dev',
-        'libgtk2.0-dev',
         'libiw-dev',
         'libnotify-dev',
         'libpulse-dev',
         'libx11-xcb-dev',
+        'libxss-dev',
         'libxt-dev',
         'mesa-common-dev',
         'python-dbus',
         'xvfb',
         'yasm',
     ]
 
     # Subclasses can add packages to this variable to have them installed.