diff --git a/index.html b/index.html
index eff8f0e..729a680 100644
--- a/index.html
+++ b/index.html
@@ -128,7 +128,7 @@
 </script>
 <script src="js/ext/oktween.js"></script>
 
-<script src="js/util.js"></script>
+<script src="js/ext/util.js"></script>
 <script src="js/ext/unicode.js"></script>
 <script src="js/ext/color.js"></script>
 <script src="js/undo.js"></script>
diff --git a/js/util.js b/js/ext/util.js
similarity index 100%
rename from js/util.js
rename to js/ext/util.js