diff --git a/.arcconfig b/.arcconfig
--- a/.arcconfig
+++ b/.arcconfig
@@ -1,5 +1,5 @@
 {
   "phabricator.uri" : "https://phabricator-dev.allizom.org/",
-  "repository.callsign": "MOZILLACENTRAL",
+  "repository.callsign": "MC",
   "history.immutable": false
 }