diff --git a/templates/custom/doc/corpus.html.ep b/templates/custom/doc/corpus.html.ep
index c3abbe0..3f97f8e 100644
--- a/templates/custom/doc/corpus.html.ep
+++ b/templates/custom/doc/corpus.html.ep
@@ -9,5 +9,5 @@
 % } else {
   <h3>Current data set: Virtual corpus <code>dereko-korap-2025-I</code></h3>
 % }
-  <iframe src="https://korap.ids-mannheim.de/data/dereko-korap-2025-I.html" sandbox="allow-forms allow-scripts" style="position: relative; border-width: 0; min-height: 80vh" height="100%" width="100%"></iframe>
+  <iframe src="https://korap.ids-mannheim.de/data/dereko-korap-2025-I.html" sandbox="allow-forms allow-scripts allow-popups allow-same-origin" style="position: relative; border-width: 0; min-height: 80vh" height="100%" width="100%"></iframe>
 </section>