diff --git a/Resources/views/captcha.html.twig b/Resources/views/captcha.html.twig
index 88fc5fc..8a23b60 100644
--- a/Resources/views/captcha.html.twig
+++ b/Resources/views/captcha.html.twig
@@ -3,7 +3,7 @@
 -
 {% else %}
 {% spaceless %}
-    <img id="{{ image_id }}" src="{{ captcha_code }}" alt="" title="captcha" width="{{ captcha_width }}" height="{{ captcha_height }}" />
+    <img class="captcha_image" id="{{ image_id }}" src="{{ captcha_code }}" alt="" title="captcha" width="{{ captcha_width }}" height="{{ captcha_height }}" />
     {% if reload %}
     <script type="text/javascript">
         function reload_{{ image_id }}() {