diff --git a/clang/.arcconfig b/clang/.arcconfig
index 048706ac96ee..b258e7a34c4d 100644
--- a/clang/.arcconfig
+++ b/clang/.arcconfig
@@ -1,4 +1,4 @@
 {
-  "project_id" : "clang",
+  "repository.callsign" : "C",
   "conduit_uri" : "https://reviews.llvm.org/"
 }