diff --git a/boilerplate.html b/boilerplate.html
index bf9adc68..15a99500 100644
--- a/boilerplate.html
+++ b/boilerplate.html
@@ -81,7 +81,6 @@ <h1>Here</h1>
 <script src="core/deck.core.js"></script>
 
 <!-- Extension JS files. Add or remove as needed. -->
-<script src="core/deck.core.js"></script>
 <script src="extensions/hash/deck.hash.js"></script>
 <script src="extensions/menu/deck.menu.js"></script>
 <script src="extensions/goto/deck.goto.js"></script>