diff --git a/src/matrix/net/HomeServerApi.js b/src/matrix/net/HomeServerApi.js
index f8c09804..30d036cb 100644
--- a/src/matrix/net/HomeServerApi.js
+++ b/src/matrix/net/HomeServerApi.js
@@ -135,6 +135,7 @@ export class HomeServerApi {
             return this._post(`/rooms/${encodeURIComponent(roomId)}/receipt/${encodeURIComponent(receiptType)}/${encodeURIComponent(eventId)}`,
                 {}, {}, options);
         }
+        return () => {};
     }
 
     passwordLogin(username, password, initialDeviceDisplayName, options = null) {