diff --git a/sphinx_rtd_theme/layout.html b/sphinx_rtd_theme/layout.html
index 21ddbaf5..ec22d0f2 100644
--- a/sphinx_rtd_theme/layout.html
+++ b/sphinx_rtd_theme/layout.html
@@ -105,7 +105,7 @@
 
           {% if logo %}
             {# Not strictly valid HTML, but it's the only way to display/scale it properly, without weird scripting or heaps of work #}
-            <img src="{{ pathto('_static/' + logo, 1) }}" class="logo" />
+            <img src="{{ pathto('_static/' + logo, 1) }}" class="logo" alt="Logo"/>
           {% endif %}
           </a>