diff --git a/src/dyna-rules.html b/src/dyna-rules.html
index 0feb56565..bb9b28260 100644
--- a/src/dyna-rules.html
+++ b/src/dyna-rules.html
@@ -52,6 +52,7 @@
 <script src="lib/codemirror/addon/merge/merge.js"></script>
 <script src="lib/codemirror/addon/selection/active-line.js"></script>
 <script src="lib/publicsuffixlist/publicsuffixlist.js"></script>
+<script src="lib/punycode.js"></script>
 
 <script src="js/codemirror/ubo-dynamic-filtering.js"></script>