diff --git a/config/config_netlify_preview.json b/config/config_netlify_preview.json
index d2a58bcd..2c503cc8 100644
--- a/config/config_netlify_preview.json
+++ b/config/config_netlify_preview.json
@@ -18,6 +18,8 @@
   "rageshake": {
     "submit_url": "https://element.io/bugreports/submit"
   },
-  "membership_keep_alive_period": 5000,
-  "membership_server_side_expiry_timeout": 15000
+  "matrix_rtc_session": {
+    "membership_keep_alive_period": 5000,
+    "membership_server_side_expiry_timeout": 15000
+  }
 }