diff --git a/.arcconfig b/.arcconfig
--- a/.arcconfig
+++ b/.arcconfig
@@ -1,5 +1,5 @@
 {
-  "phabricator.uri" : "https://phabricator.services.mozilla.com/",
-  "repository.callsign": "RELEASE",
+  "phabricator.uri" : "https://phabricator-dev.allizom.org/",
+  "repository.callsign": "MOZILLACENTRAL",
   "history.immutable": false
 }
diff --git a/layout/tools/reftest/output.py b/layout/tools/reftest/output.py
--- a/layout/tools/reftest/output.py
+++ b/layout/tools/reftest/output.py
@@ -186,5 +186,7 @@
     def verbatim(self, line):
         if self.stack_fixer_function:
             line = self.stack_fixer_function(line)
         name = self.proc_name or threading.current_thread().name
         self.log.process_output(name, line)
+
+This should raise flake8 without breaking mach