diff --git a/src/UnicaenAuth/Authentication/Adapter/Db.php b/src/UnicaenAuth/Authentication/Adapter/Db.php
index 2e9a8704a72e4e89cdeef78a30443d38061a7341..c216906cad54541e8b4308cb81a3bf33939fe859 100644
--- a/src/UnicaenAuth/Authentication/Adapter/Db.php
+++ b/src/UnicaenAuth/Authentication/Adapter/Db.php
@@ -1,9 +1,9 @@
 <?php
+
 namespace UnicaenAuth\Authentication\Adapter;
 
-use PDOException;
-use Zend\ServiceManager\Exception\ServiceNotFoundException;
 use UnicaenAuth\Options\ModuleOptions;
+use Zend\ServiceManager\Exception\ServiceNotFoundException;
 use Zend\ServiceManager\ServiceManager;
 use Zend\ServiceManager\ServiceManagerAwareInterface;
 use ZfcUser\Authentication\Adapter\AdapterChainEvent as AuthEvent;
@@ -39,13 +39,10 @@ class Db extends \ZfcUser\Authentication\Adapter\Db implements ServiceManagerAwa
         try {
             $result = parent::authenticate($e);
         }
-        catch (PDOException $e) {
-            return false;
-        }
         catch (ServiceNotFoundException $e) {
             return false;
         }
-       
+
         return $result;
     }