diff --git a/biscuit/apps/untis/templates/untis/untis_import.html b/biscuit/apps/untis/templates/untis/untis_import.html
index fca79b1aeff9ae6200ed32d4c514ea69e29ad9bf..8a7236ba4fb143ebd29a847f7bc6ee658d258011 100644
--- a/biscuit/apps/untis/templates/untis/untis_import.html
+++ b/biscuit/apps/untis/templates/untis/untis_import.html
@@ -37,7 +37,7 @@
     {% csrf_token %}
     {% bootstrap_form upload_form %}
 
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Process{% endblocktrans %}
     </button>
   </form>