diff --git a/src/Extensions/LDAPMemberExtension.php b/src/Extensions/LDAPMemberExtension.php
index 679bebe..b5fe7a7 100644
--- a/src/Extensions/LDAPMemberExtension.php
+++ b/src/Extensions/LDAPMemberExtension.php
@@ -185,7 +185,7 @@ protected function updateCMSFields(FieldList $fields)
      * @param  ValidationResult
      * @throws ValidationException
      */
-    public function validate(ValidationResult $validationResult)
+    protected function updateValidate(ValidationResult $validationResult)
     {
         // We allow empty Username for registration purposes, as we need to
         // create Member records with empty Username temporarily. Forms should explicitly