diff --git a/umap/templates/umap/js.html b/umap/templates/umap/js.html
index 740610cd..26edc820 100644
--- a/umap/templates/umap/js.html
+++ b/umap/templates/umap/js.html
@@ -1,5 +1,6 @@
 {% load static %}
 
+<script type="module" src="{% static 'umap/vendors/leaflet/leaflet-src.esm.js' %}" defer></script>
 <script type="module" src="{% static 'umap/js/modules/global.js' %}" defer></script>
 <script src="{% static 'umap/vendors/editable/Path.Drag.js' %}" defer></script>
 <script src="{% static 'umap/vendors/editable/Leaflet.Editable.js' %}" defer></script>