diff --git a/testing/mozharness/configs/single_locale/mozilla-beta.py b/testing/mozharness/configs/single_locale/mozilla-beta.py
index fd3d5f91e8b1..1b766fd0710d 100644
--- a/testing/mozharness/configs/single_locale/mozilla-beta.py
+++ b/testing/mozharness/configs/single_locale/mozilla-beta.py
@@ -1,3 +1,5 @@
+import os
+
 config = {
     "nightly_build": True,
     "branch": "mozilla-beta",
diff --git a/testing/mozharness/configs/single_locale/mozilla-release.py b/testing/mozharness/configs/single_locale/mozilla-release.py
index 303d4f9ffb4b..fc62645eac78 100644
--- a/testing/mozharness/configs/single_locale/mozilla-release.py
+++ b/testing/mozharness/configs/single_locale/mozilla-release.py
@@ -1,3 +1,5 @@
+import os
+
 config = {
     "nightly_build": True,
     "branch": "mozilla-release",