diff --git a/modoboa/templates/common/generic_modal.html b/modoboa/templates/common/generic_modal.html
index 8a63be2cf..373c5ed13 100644
--- a/modoboa/templates/common/generic_modal.html
+++ b/modoboa/templates/common/generic_modal.html
@@ -1,12 +1,17 @@
 {% load i18n %}
-<div class="modal-header">
-  <a class="close" data-dismiss="modal">x</a>
-  <h3>{{ title }}</h3>
-</div>
-<div class="modal-body">
-  {% block modalbody %}{% endblock %}
-</div>
-<div class="modal-footer">
-  {% if action_label %}<a href="#" class="btn btn-primary {{ action_classes }}">{{ action_label }}</a>{% endif %}
-  <a class="btn" data-dismiss="modal">{% trans "Close" %}</a>
-</div>
+
+<div class="modal-dialog">
+    <div class="modal-content">
+        <div class="modal-header">
+          <a class="close" data-dismiss="modal">x</a>
+          <h3>{{ title }}</h3>
+        </div>
+        <div class="modal-body">
+          {% block modalbody %}{% endblock %}
+        </div>
+        <div class="modal-footer">
+          {% if action_label %}<a href="#" class="btn btn-primary {{ action_classes }}">{{ action_label }}</a>{% endif %}
+          <a class="btn" data-dismiss="modal">{% trans "Close" %}</a>
+        </div>
+    </div><!-- /.modal-content -->
+</div><!-- /.modal-dialog -->