diff --git a/config/config.sample.json b/config/config.sample.json
index d1cf2bb9..fbd898c7 100644
--- a/config/config.sample.json
+++ b/config/config.sample.json
@@ -14,7 +14,7 @@
   "ssla": "https://static.element.io/legal/element-software-and-services-license-agreement-uk-1.pdf",
   "matrix_rtc_session": {
     "key_rotation_on_leave_delay": 3000,
-    "membership_keep_alive_period": 6000000,
+    "membership_event_expiry_ms": 6000000,
     "delayed_leave_event_delay_ms": 18000,
     "delayed_leave_event_restart_ms": 5000
   }