diff --git a/src/synapse/dataProvider.js b/src/synapse/dataProvider.js
index ee76315..6b234c9 100644
--- a/src/synapse/dataProvider.js
+++ b/src/synapse/dataProvider.js
@@ -296,8 +296,16 @@ const resourceMap = {
     }),
   },
   p3url: {
-    path: "/_synapse/admin/v1/registration_tokens",
-    data: "p3url"
+    map: m => ({
+      id: m,
+    }),
+    reference: id => ({
+      endpoint: `/_synapse/admin/v1/rooms/${id}/members`,
+    }),
+    data: "p3url",
+    total: json => {
+      return json.total;
+    },
   }
 };