diff --git a/ietf/templates/meeting/group_materials.html b/ietf/templates/meeting/group_materials.html
index 9f84c9e02..b1694b304 100644
--- a/ietf/templates/meeting/group_materials.html
+++ b/ietf/templates/meeting/group_materials.html
@@ -8,7 +8,7 @@
     <a name="session.group-{{ session.group.acronym }}"></a>
     {% endcomment %}
     {% if session.name %}
-      <div class="anchor-target" id="{{ session.name }}">{{ session.name }}</div>
+      <div class="anchor-target" id="{{ session.name|slugify }}">{{ session.name }}</div>
     {% else %}
       <div class="anchor-target" id="{{session.group.acronym}}">{{session.group.acronym}}</div>
       {% if session.group.state.slug == "bof" %}