diff --git a/modules/cas/lib/Auth/Source/CAS.php b/modules/cas/lib/Auth/Source/CAS.php
index 45f77679860afdbc68f4b93327be0d80619ef908..faa52d09cc4c1fe05f7bf4505f5f83b933692b9d 100644
--- a/modules/cas/lib/Auth/Source/CAS.php
+++ b/modules/cas/lib/Auth/Source/CAS.php
@@ -151,7 +151,7 @@ class sspmod_cas_Auth_Source_CAS  extends SimpleSAML_Auth_Source  {
 	 * @param string $service
 	 * @return list username and attributes
 	 */
-	private function casValidation($ticket, $service){
+	protected function casValidation($ticket, $service){
 		switch($this->_validationMethod){
 			case 'validate':
 				return  $this->casValidate($ticket, $service);