diff --git a/webapp/web/templates/freemarker/lib/lib-properties.ftl b/webapp/web/templates/freemarker/lib/lib-properties.ftl
index 3daac0983..b5a8ceaed 100644
--- a/webapp/web/templates/freemarker/lib/lib-properties.ftl
+++ b/webapp/web/templates/freemarker/lib/lib-properties.ftl
@@ -57,7 +57,7 @@
         <#local subclassName = subclass.name!>
         <#if subclassName?has_content>
             <li class="subclass" role="listitem">
-                <h3>${subclassName?lower_case}</h
+                <h3>${subclassName?lower_case}</h3>
                 <ul class="subclass-property-list">
                     <@objectPropertyList property editable subclass.statements template />
                 </ul>