diff --git a/share/jupyter/voila/templates/base/voila_setup.macro.html.j2 b/share/jupyter/voila/templates/base/voila_setup.macro.html.j2
index 39bb0d103..1e615ebd0 100644
--- a/share/jupyter/voila/templates/base/voila_setup.macro.html.j2
+++ b/share/jupyter/voila/templates/base/voila_setup.macro.html.j2
@@ -1,14 +1,19 @@
 {%- macro voila_setup(base_url, nbextensions) -%}
 <script>
-requirejs.config({ baseUrl: '{{base_url}}voila/', waitSeconds: 30})
-window.voila_js_url = "{{ static_url('voila.js')}}"
-requirejs(
-    [
-        "{{ static_url('main.js') }}",
-    {% for ext in nbextensions -%}
-        "{{base_url}}voila/nbextensions/{{ ext }}.js",
-    {% endfor %}
-    ]
-)
+  requirejs.config({ baseUrl: '{{base_url}}voila/', waitSeconds: 30});
+  window.voila_js_url = "{{ static_url('voila.js')}}";
+  requirejs(["{{ static_url('main.js') }}"]);
+
+  // Loading classic notebook extensions.
+  {% for ext in nbextensions -%}
+  requirejs(["{{base_url}}voila/nbextensions/{{ ext }}.js"],
+    function() {
+      console.log("Loaded classic notebook extension \"{{ ext }}\".");
+    },
+    function() {
+      console.error("Failed to load classic notebook extension \"{{ ext }}\".");
+    }
+  );
+  {% endfor %}
 </script>
 {%- endmacro %}