diff --git a/templates/base.twig b/templates/base.twig
index 316291ce814315e30f85d10ded6954c03268872f..d7fdd353353fc7c79c4d0a4577be64b82d3660e5 100644
--- a/templates/base.twig
+++ b/templates/base.twig
@@ -21,6 +21,9 @@
 {% block header %}{% include "_header.twig" %}{% endblock %}
         <div id="content">
             <div class="wrap">
+            {% if not isProduction -%}
+            <div class="message-box warning">{{ 'pre-production-warning' | trans }}</div>
+            {% endif -%}
                 {% block contentwrapper -%}
                     {% block content %}{% endblock -%}
                 {% endblock %}