--- a/testing/mozharness/configs/releases/dev_bouncer_firefox_beta.py
+++ b/testing/mozharness/configs/releases/dev_bouncer_firefox_beta.py
@@ -1,11 +1,12 @@
 # lint_ignore=E501
 config = {
     "bouncer_prefix": "https://bouncer-bouncer-releng.stage.mozaws.net/",
+    "locales": ["en-US"],
     "products": {
         "installer": {
             "product-name": "Firefox-%(version)s",
             "check_uptake": True,
             "alias": "firefox-beta-latest",
             "ssl-only": False,
             "add-locales": False,
             "paths": {

--- a/testing/mozharness/configs/releases/dev_bouncer_firefox_devedition.py
+++ b/testing/mozharness/configs/releases/dev_bouncer_firefox_devedition.py
@@ -1,11 +1,12 @@
 # lint_ignore=E501
 config = {
     "shipped-locales-url": "https://hg.mozilla.org/%(repo)s/raw-file/%(revision)s/browser/locales/shipped-locales",
+    "locales": ["en-US"],
     "bouncer_prefix": "https://bouncer-bouncer-releng.stage.mozaws.net/",
     "products": {
         "installer": {
             "product-name": "Devedition-%(version)s",
             "check_uptake": True,
             "alias": "firefox-devedition-latest",
             "ssl-only": False,
             "add-locales": True,