diff --git a/proposals/XXXX-sync-server-and-client-time-endpoint.md b/proposals/XXXX-sync-server-and-client-time-endpoint.md
index 0cc6d3a54..6623a39b3 100644
--- a/proposals/XXXX-sync-server-and-client-time-endpoint.md
+++ b/proposals/XXXX-sync-server-and-client-time-endpoint.md
@@ -1,4 +1,4 @@
-# MSC0000: Sync Server and Client Times with endpoint
+# MSC4094: Sync Server and Client Times with endpoint
 
 Some functionality in matrix depend on all clients local clocks being in sync.
 Examples are: