diff --git a/c3l_membership/templates/index.html b/c3l_membership/templates/index.html
--- a/c3l_membership/templates/index.html
+++ b/c3l_membership/templates/index.html
@@ -47,7 +47,7 @@
             {% endfor %}
           {% endfor %}
         {% endif %}
-        <form class="pure-form pure-form-stacked" method="POST" action="/">
+        <form class="pure-form pure-form-stacked" method="POST" action="{{ url_for('root.index', lang_code=g.lang_code) }}">
           <fieldset>
             {{ form.hidden_tag() }}
             <legend>{% trans %}Required information{% endtrans %}</legend>