--- a/misc.py
+++ b/misc.py
@@ -2646,16 +2646,20 @@ def generateSpiderMonkeyObjects(project,
             factory_kwargs['env'] = env
 
             extra_args = ['-r', WithProperties("%(revision)s")]
             extra_args += ['--platform', platform]  # distinguish win64
             extra_args += mirrorAndBundleArgs(bconfig)
             extra_args += [variant]
             extra_args += ['--ttserver',
                            'https://api.pub.build.mozilla.org/tooltool/']
+            if 'win' in platform:
+                extra_args += ['--ttauthfile', 'c:\\builds\\relengapi.tok']
+            else:
+                extra_args += ['--ttauthfile', '/builds/relengapi.tok']
 
             f = ScriptFactory(
                 config['scripts_repo'],
                 'scripts/spidermonkey_builds/spidermonkey.sh',
                 interpreter=interpreter,
                 log_eval_func=rc_eval_func({1: WARNINGS}),
                 extra_args=tuple(extra_args),
                 script_timeout=3600,