--- a/mozilla/project_branches.py
+++ b/mozilla/project_branches.py
@@ -99,16 +99,17 @@ PROJECT_BRANCHES = {
         'nightly_signing_servers': 'nightly-signing',
         'l10n_repo_path': 'releases/l10n/mozilla-release',
         'pgo_strategy': 'per-checkin',
         'enable_mac_a11y': True,
         'enable_l10n': True,
         'enable_l10n_onchange': True,
         'enUS_binaryURL': '/nightly/latest-alder',
         'l10nNightlyUpdate': True,
+        'l10nDatedDirs': True,
         'l10n_tree': 'fxrel',
         'l10n_platforms': ['linux', 'linux64', 'win32', 'macosx64'],
         # explicitly set the server to avoid using variables
         'localesURL': 'http://hg.mozilla.org/build/buildbot-configs/raw-file/production/mozilla/l10n/all-locales.alder',
         'enable_multi_locale': True,
         'upload_mobile_symbols': True,
         'enable_valgrind': False,
         'enabled_products': ['firefox'],