diff --git a/wagtail/documents/static_src/wagtaildocs/js/document-chooser.js b/wagtail/documents/static_src/wagtaildocs/js/document-chooser.js
index ed50176748..9af31e01ea 100644
--- a/wagtail/documents/static_src/wagtaildocs/js/document-chooser.js
+++ b/wagtail/documents/static_src/wagtaildocs/js/document-chooser.js
@@ -6,7 +6,7 @@ function createDocumentChooser(id) {
 
     $('.action-choose', chooserElement).on('click', function() {
         ModalWorkflow({
-            url: window.chooserUrls.documentChooser,
+            url: chooserElement.data('chooserUrl'),
             onload: DOCUMENT_CHOOSER_MODAL_ONLOAD_HANDLERS,
             responses: {
                 documentChosen: function(docData) {
diff --git a/wagtail/documents/templates/wagtaildocs/widgets/document_chooser.html b/wagtail/documents/templates/wagtaildocs/widgets/document_chooser.html
index 78df5b689f..39a492a97f 100644
--- a/wagtail/documents/templates/wagtaildocs/widgets/document_chooser.html
+++ b/wagtail/documents/templates/wagtaildocs/widgets/document_chooser.html
@@ -1,5 +1,6 @@
 {% extends "wagtailadmin/widgets/chooser.html" %}
 {% block chooser_class %}document-chooser{% endblock %}
+{% block chooser_attributes %}data-chooser-url="{% url "wagtaildocs:chooser" %}"{% endblock %}
 
 {% block chosen_state_view %}
     <span class="title">{{ document.title }}</span>