diff --git a/dspace/config/spring/api/discovery.xml b/dspace/config/spring/api/discovery.xml
index eeafd9152c..28e1275f27 100644
--- a/dspace/config/spring/api/discovery.xml
+++ b/dspace/config/spring/api/discovery.xml
@@ -211,7 +211,7 @@
         <property name="sortOrder" value="COUNT"/>
     </bean>
 
-    <bean id="searchFilterSubject" class="org.dspace.discovery.configuration.DiscoverySearchFilterFacet">
+    <bean id="searchFilterSubject" class="org.dspace.discovery.configuration.HierarchicalSidebarFacetConfiguration">
         <property name="indexFieldName" value="subject"/>
         <property name="metadataFields">
             <list>
@@ -220,6 +220,7 @@
         </property>
         <property name="facetLimit" value="10"/>
         <property name="sortOrder" value="COUNT"/>
+        <property name="splitter" value="::"/>
     </bean>
 
     <bean id="searchFilterIssued" class="org.dspace.discovery.configuration.DiscoverySearchFilterFacet">