diff --git a/lib/base-apis.js b/lib/base-apis.js
index 7a93c9414..497859a91 100644
--- a/lib/base-apis.js
+++ b/lib/base-apis.js
@@ -122,7 +122,7 @@ MatrixBaseApis.prototype.loginFlows = function(callback) {
  * @param {module:client.callback} callback Optional.
  * @return {module:client.Promise} Resolves: On success, the empty object
  */
-MatrixClient.prototype.logout = function(callback) {
+MatrixBaseApis.prototype.logout = function(callback) {
     return this._http.authedRequest(
         callback, "POST", '/logout'
     );