diff --git a/core/Resources/views/file_manager/info.html.twig b/core/Resources/views/file_manager/info.html.twig
index 649a352..ab55b32 100644
--- a/core/Resources/views/file_manager/info.html.twig
+++ b/core/Resources/views/file_manager/info.html.twig
@@ -26,7 +26,7 @@
                     </li>
                 {% endif %}
 
-                {% if splInfo.extension in ['jpeg', 'jpg', 'gif', 'png', 'svg'] %}
+                {% if splInfo.extension|lower in ['jpeg', 'jpg', 'gif', 'png', 'svg'] %}
                     <li class="nav-item" role="presentation">
                         <a class="nav-link {% if tab == 'preview' %}active{% endif %}" data-toggle="tab" href="#tab-fm-preview">
                             {{ 'Preview'|trans }}