--- a/testing/mozharness/scripts/desktop_l10n.py
+++ b/testing/mozharness/scripts/desktop_l10n.py
@@ -55,25 +55,27 @@ FAILURE_STR = "Failed"
 # it's a list of values that are already known before starting a build
 configuration_tokens = ('branch',
                         'platform',
                         'update_platform',
                         'update_channel',
                         'ssh_key_dir',
                         'stage_product',
                         'upload_environment',
-                       )
+                        )
 # some other values such as "%(version)s", "%(buildid)s", ...
 # are defined at run time and they cannot be enforced in the _pre_config_lock
 # phase
 runtime_config_tokens = ('buildid', 'version', 'locale', 'from_buildid',
                          'abs_objdir', 'abs_merge_dir', 'revision',
-                         'to_buildid', 'en_us_binary_url', 'mar_tools_url',
+                         'to_buildid', 'en_us_binary_url',
+                         'en_us_installer_binary_url', 'mar_tools_url',
                          'post_upload_extra', 'who')
 
+
 # DesktopSingleLocale {{{1
 class DesktopSingleLocale(LocalesMixin, ReleaseMixin, MockMixin, BuildbotMixin,
                           VCSMixin, SigningMixin, PurgeMixin, BaseScript,
                           BalrogMixin, MarMixin, VirtualenvMixin, TransferMixin):
     """Manages desktop repacks"""
     config_options = [[
         ['--balrog-config', ],
         {"action": "extend",
@@ -363,16 +365,22 @@ class DesktopSingleLocale(LocalesMixin, 
         # Override en_us_binary_url if passed as a buildbot property
         if self.buildbot_config["properties"].get("en_us_binary_url"):
             self.info("Overriding en_us_binary_url with %s" %
                       self.buildbot_config["properties"]["en_us_binary_url"])
             replace_dict['en_us_binary_url'] = \
                 str(self.buildbot_config["properties"]["en_us_binary_url"])
         bootstrap_env = self.query_env(partial_env=config.get("bootstrap_env"),
                                        replace_dict=replace_dict)
+        # Override en_us_installer_binary_url if passed as a buildbot property
+        if self.buildbot_config["properties"].get("en_us_installer_binary_url"):
+            self.info("Overriding en_us_binary_url with %s" %
+                      self.buildbot_config["properties"]["en_us_installer_binary_url"])
+            bootstrap_env['EN_US_INSTALLER_BINARY_URL'] = str(
+                self.buildbot_config["properties"]["en_us_installer_binary_url"])
         if 'MOZ_SIGNING_SERVERS' in os.environ:
             sign_cmd = self.query_moz_sign_cmd(formats=None)
             sign_cmd = subprocess.list2cmdline(sign_cmd)
             # windows fix
             bootstrap_env['MOZ_SIGN_CMD'] = sign_cmd.replace('\\', '\\\\\\\\')
         for binary in self._mar_binaries():
             # "mar -> MAR" and 'mar.exe -> MAR' (windows)
             name = binary.replace('.exe', '')