diff --git a/config/alfresco/linkvalidation-service-context.xml b/config/alfresco/linkvalidation-service-context.xml
index e2d07a878a..b1b8a59b59 100644
--- a/config/alfresco/linkvalidation-service-context.xml
+++ b/config/alfresco/linkvalidation-service-context.xml
@@ -41,6 +41,7 @@
                 <value>asp</value>
                 <value>axs</value>
                 <value>bhtml</value>
+                <value>css</value>
                 <value>dci</value>
                 <value>dht</value>
                 <value>dochtml</value>