diff --git a/helmfile/apps/open-xchange/values-openxchange.yaml.gotmpl b/helmfile/apps/open-xchange/values-openxchange.yaml.gotmpl
index e137f94a..eaaacebb 100644
--- a/helmfile/apps/open-xchange/values-openxchange.yaml.gotmpl
+++ b/helmfile/apps/open-xchange/values-openxchange.yaml.gotmpl
@@ -247,6 +247,8 @@ appsuite:
     propertiesFiles:
       /opt/open-xchange/etc/AdminDaemon.properties:
         MASTER_ACCOUNT_OVERRIDE: "true"
+      /opt/open-xchange/etc/AdminUser.properties:
+        USERNAME_CHANGEABLE: "true"
       /opt/open-xchange/etc/system.properties:
         SERVER_NAME: "oxserver"
       /opt/open-xchange/etc/ldapauth.properties: