diff --git a/django/contrib/admin/templates/admin/base.html b/django/contrib/admin/templates/admin/base.html
index 28a9dac291..63d4419fae 100644
--- a/django/contrib/admin/templates/admin/base.html
+++ b/django/contrib/admin/templates/admin/base.html
@@ -53,7 +53,7 @@
     {% block messages %}
         {% if messages %}
         <ul class="messagelist">{% for message in messages %}
-          <li{% if message.tags %} class="{{ message.tags }}"{% endif %}>{{ message }}</li>
+          <li{% if message.tags %} class="{{ message.tags }}"{% endif %}>{{ message|capfirst }}</li>
         {% endfor %}</ul>
         {% endif %}
     {% endblock messages %}