diff --git a/changelog.d/4211.bugfix b/changelog.d/4211.bugfix
new file mode 100644
index 0000000000..376f80c55a
--- /dev/null
+++ b/changelog.d/4211.bugfix
@@ -0,0 +1,2 @@
+fix start up failure when mau_limit_reserved_threepids set and db is postgres 
+