diff --git a/notebook/templates/tree.html b/notebook/templates/tree.html
index 0790c19f1..050da8bdc 100644
--- a/notebook/templates/tree.html
+++ b/notebook/templates/tree.html
@@ -167,5 +167,9 @@ data-terminals-available="{{terminals_available}}"
 {% block script %}
     {{super()}}
 
-<script src="{{ static_url("tree/js/main.min.js") }}" type="text/javascript" charset="utf-8"></script>
+{% if ignore_minified_js %}
+    <script src="{{ static_url("tree/js/main.js") }}" type="text/javascript" charset="utf-8"></script>
+{% else %}
+    <script src="{{ static_url("tree/js/main.min.js") }}" type="text/javascript" charset="utf-8"></script>
+{% endif %}
 {% endblock %}