diff --git a/addons/plugin_thunderbird/plugin_thunderbird.xml b/addons/plugin_thunderbird/plugin_thunderbird.xml
index 5ea5fc38219..bb24a0b5957 100644
--- a/addons/plugin_thunderbird/plugin_thunderbird.xml
+++ b/addons/plugin_thunderbird/plugin_thunderbird.xml
@@ -10,7 +10,9 @@
                     <form position="attributes">
                         <attribute name="string">Install Thunderbird Plug-In</attribute>
                     </form>
-                    <xpath expr="//footer" position="replace"/>
+                    <xpath expr="//footer" position="replace">
+                        <button string="Close" class="oe_link" special="cancel" />
+                    </xpath>
                     <xpath expr="//separator[@string='title']" position="after">
                         <group>
                             <field name="thunderbird" invisible="1"/>