diff --git a/framework/source/class/qx/dev/StackTrace.js b/framework/source/class/qx/dev/StackTrace.js
index 12d93e7904..bb0cdbbfed 100644
--- a/framework/source/class/qx/dev/StackTrace.js
+++ b/framework/source/class/qx/dev/StackTrace.js
@@ -1,4 +1,4 @@
-/* eslint strict:0 */
+"use strict";
 /* ************************************************************************
 
    qooxdoo - the new era of web development