--- a/process/release.py
+++ b/process/release.py
@@ -1386,17 +1386,18 @@ def generateReleaseBranchObjects(release
                 # Append Firefox UI update verify tests
                 for n, builder_name in ui_update_verify_builders(platform, channel).iteritems():
                     ui_uv_factory = ScriptFactory(
                         interpreter='python',
                         scriptRepo=mozharness_repo,
                         scriptName='scripts/firefox_ui_updates.py',
                         extra_args=[
                             '--cfg', 'generic_releng_config.py',
-                            '--cfg', 'update_tests/{}.py'.format(sourceRepoInfo["name"]),
+                            '--firefox-ui-branch', sourceRepoInfo['name'],
+                            '--update-verify-config', updateConfig['verifyConfigs'][platform],
                             '--tools-tag', runtimeTag,
                             '--total-chunks', str(ui_update_verify_chunks),
                             '--this-chunk', str(n)
                         ],
                     )
 
                     builddir = '%(prefix)s_%(this_chunk)s' % {
                         'prefix': builderPrefix(postfix='%s_%s_update_tests' % (platform, channel)),