diff --git a/example_configs/authelia_config.yml b/example_configs/authelia_config.yml
index b5bc67e..cb2c577 100644
--- a/example_configs/authelia_config.yml
+++ b/example_configs/authelia_config.yml
@@ -30,11 +30,11 @@ authentication_backend:
     additional_users_dn: ou=people
     # To allow sign in both with username and email, one can use a filter like
     # (&(|({username_attribute}={input})({mail_attribute}={input}))(objectClass=person))
-    users_filter: (&({username_attribute}={input})(objectClass=person))
+    users_filter: "(&({username_attribute}={input})(objectClass=person))"
     # Set this to ou=groups, because all groups are stored in this ou
     additional_groups_dn: ou=groups
     # Only this filter is supported right now
-    groups_filter: (member={dn})
+    groups_filter: "(member={dn})"
     # The attribute holding the name of the group.
     group_name_attribute: cn
     # Email attribute