--- a/mobile/android/moz.configure
+++ b/mobile/android/moz.configure
@@ -58,17 +58,17 @@ project_flag('MOZ_ANDROID_MLS_STUMBLER',
              default=True)
 
 project_flag('MOZ_ANDROID_DOWNLOAD_CONTENT_SERVICE',
              help='Background service for downloading additional content at runtime',
              default=True)
 
 project_flag('MOZ_ANDROID_CUSTOM_TABS',
              help='Enable support for Android custom tabs',
-             default=delayed_getattr(milestone, 'is_nightly'))
+             default=is_nightly)
 
 # Enable the Switchboard A/B framework code.
 # Note: The framework is always included in the app. This flag controls
 # usage of the framework.
 project_flag('MOZ_SWITCHBOARD',
              help='Include Switchboard A/B framework on Android',
              default=True)