diff --git a/symposion/templates/sponsorship/_sponsor_link.html b/symposion/templates/sponsorship/_sponsor_link.html
index 98f5408b25fd61378ffa49eac297a3946084b761..7b912bdbc4f1601b23314b90ea429830f12cfc37 100644
--- a/symposion/templates/sponsorship/_sponsor_link.html
+++ b/symposion/templates/sponsorship/_sponsor_link.html
@@ -2,9 +2,9 @@
 {% spaceless %}
 <a href="{{ sponsor.external_url }}">
     {% if dimensions %}
-        <img id="Sponsor{{ sponsor.id }} src="{% thumbnail sponsor.logo dimensions %}" alt="{{ sponsor.name }}" />
+        <img id="sponsor_{{ sponsor.pk }}" src="{% thumbnail sponsor.logo dimensions %}" alt="{{ sponsor.name }}" />
     {% else %}
-        <img id="Sponsor{{ sponsor.id }}" src="{% thumbnail sponsor.logo '150x150' %}" alt="{{ sponsor.name }}" />
+        <img id="sponsor_{{ sponsor.pk }}" src="{% thumbnail sponsor.logo '150x150' %}" alt="{{ sponsor.name }}" />
     {% endif %}
 </a>
 {% endspaceless %}