--- a/buildfarm/release/release-runner.py
+++ b/buildfarm/release/release-runner.py
@@ -444,17 +444,18 @@ def main(options):
             kwargs = {
                 "public_key": docker_worker_key,
                 "version": release["version"],
                 # ESR should not use "esr" suffix here:
                 "next_version": bump_version(release["version"].replace("esr", "")),
                 "appVersion": getAppVersion(release["version"]),
                 "buildNumber": release["buildNumber"],
                 "release_eta": release.get("release_eta"),
-                "source_enabled": True,
+                # XXX Bug 1400157 hotfix
+                "source_enabled": False if '57' in release["version"] else True,
                 "checksums_enabled": True,
                 "binary_transparency_enabled": branchConfig.get("binary_transparency_enabled", False),
                 "repo_path": release["branch"],
                 "revision": release["mozillaRevision"],
                 "product": release["product"],
                 "funsize_product": get_funsize_product(release["product"]),
                 # if mozharness_revision is not passed, use 'revision'
                 "mozharness_changeset": release.get('mh_changeset') or release['mozillaRevision'],