diff --git a/sapl/templates/base.html b/sapl/templates/base.html
index d15523313..ef29c5a93 100644
--- a/sapl/templates/base.html
+++ b/sapl/templates/base.html
@@ -267,7 +267,7 @@
       <script type="text/javascript" >
         function inIframe () {
           try {
-              return window.self !== window.top;
+              return window.location !== window.parent.location
           } catch (e) {
               return true;
           }