diff --git a/doc/installation.md b/doc/installation.md
index 4f481dcb1..57abe0dd2 100644
--- a/doc/installation.md
+++ b/doc/installation.md
@@ -501,4 +501,6 @@ The first release candidate of Icinga Web 2 introduces the following non-backwar
 
 ## <a id="upgrading-to-2.1.x"></a> Upgrading to Icinga Web 2 2.1.x
 
-Icinga Web 2 2.1.x does not introduce any backward incompatible change.
+* Since Icinga Web 2 version 2.1.3 LDAP user group backends respect the configuration option `group_filter`.
+  Users who changed the configuration manually and used the option `filter` instead
+  have to change it back to `group_filter`.
diff --git a/library/Icinga/Authentication/UserGroup/LdapUserGroupBackend.php b/library/Icinga/Authentication/UserGroup/LdapUserGroupBackend.php
index 8a17f6160..3f912b0ca 100644
--- a/library/Icinga/Authentication/UserGroup/LdapUserGroupBackend.php
+++ b/library/Icinga/Authentication/UserGroup/LdapUserGroupBackend.php
@@ -705,7 +705,7 @@ class LdapUserGroupBackend extends LdapRepository implements UserGroupBackendInt
             ->setGroupNameAttribute($config->get('group_name_attribute', $defaults->group_name_attribute))
             ->setUserNameAttribute($config->get('user_name_attribute', $defaults->user_name_attribute))
             ->setGroupMemberAttribute($config->get('group_member_attribute', $defaults->group_member_attribute))
-            ->setGroupFilter($config->filter)
+            ->setGroupFilter($config->group_filter)
             ->setUserFilter($config->user_filter);
     }