--- a/buildfarm/release/release-runner.py
+++ b/buildfarm/release/release-runner.py
@@ -486,17 +486,17 @@ def main(options):
                 "appVersion": getAppVersion(release["version"]),
                 "buildNumber": release["buildNumber"],
                 "source_enabled": True,
                 "checksums_enabled": True,
                 "repo_path": release["branch"],
                 "revision": release["mozillaRevision"],
                 "product": release["product"],
                 # if mozharness_revision is not passed, use 'revision'
-                "mozharness_changeset": release.get('mh_changeset', release['mozillaRevision']),
+                "mozharness_changeset": release.get('mh_changeset') or release['mozillaRevision'],
                 "partial_updates": getPartials(release),
                 "branch": branch,
                 "updates_enabled": bool(release["partials"]),
                 "l10n_config": get_l10n_config(release, branchConfig, branch, l10n_changesets, index),
                 "en_US_config": get_en_US_config(release, branchConfig, branch, index),
                 "verifyConfigs": {},
                 "balrog_api_root": branchConfig["balrog_api_root"],
                 "funsize_balrog_api_root": branchConfig["funsize_balrog_api_root"],