diff --git a/sources/Afup/Utils/Configuration.php b/sources/Afup/Utils/Configuration.php
index 0b36fe190..910b38bf0 100644
--- a/sources/Afup/Utils/Configuration.php
+++ b/sources/Afup/Utils/Configuration.php
@@ -11,67 +11,56 @@
  */
 class Configuration
 {
-    /**
-     * Valeurs de configuration
-     */
-    private $_valeurs;
+    static private $values;
 
-    /**
-     * Charge les valeurs depuis le fichier de configuration
-     */
     public function __construct()
     {
+        if (self::$values) {
+            return;
+        }
+
         $sfParameters = $this->loadSymfonyParameters();
-        if ([] !== $sfParameters) {
-            $this->_valeurs['database_host'] = $sfParameters['database_host'] ?? '';
-            $this->_valeurs['database_name'] = $sfParameters['database_name'] ?? '';
-            $this->_valeurs['database_user'] = $sfParameters['database_user'] ?? '';
-            $this->_valeurs['database_password'] = $sfParameters['database_password'] ?? '';
+        $parameters = [
+            'database_host', 'database_name', 'database_user', 'database_password',
+            'smtp_host', 'smtp_port', 'smtp_tls', 'smtp_username', 'smtp_password',
+            'mailer_force_recipients', 'mailer_bcc'
+        ];
 
-            $this->_valeurs['smtp_host'] = $sfParameters['smtp_host'] ?? '';
-            $this->_valeurs['smtp_port'] = $sfParameters['smtp_port'] ?? '';
-            $this->_valeurs['smtp_tls'] = $sfParameters['smtp_tls'] ?? '';
-            $this->_valeurs['smtp_username'] = $sfParameters['smtp_username'] ?? '';
-            $this->_valeurs['smtp_password'] = $sfParameters['smtp_password'] ?? '';
+        foreach($parameters as $param) {
+
+            // env var exist ?
+            if (false !== $value = getenv(strtoupper($param))) {
+                self::$values[$param] = $value;
+            }
 
-            $this->_valeurs['mailer_force_recipients'] = $sfParameters['mailer_force_recipients'] ?? '';
-            $this->_valeurs['mailer_bcc'] = $sfParameters['mailer_bcc'] ?? '';
+            // override by parameter_ENV.yaml ?
+            if (isset($sfParameters[$param])) {
+                self::$values[$param] = $sfParameters[$param];
+            }
         }
+
     }
 
     private function loadSymfonyParameters(): array
     {
-        static $parameters = [];
-
-        if ([] === $parameters) {
-            $basePath = __DIR__ . '/../../../app/config';
+        $parameters = [];
+        $basePath = __DIR__ . '/../../../app/config';
 
-            $this->mergeSymfonyParametersFromFile($basePath . '/parameters.yml', $parameters);
-            $this->mergeSymfonyParametersFromFile($basePath . '/config.yml', $parameters);
-            if (isset($_ENV['SYMFONY_ENV'])) {
-                $this->mergeSymfonyParametersFromFile($basePath . '/config_' . $_ENV['SYMFONY_ENV'] . '.yml', $parameters);
+        if (isset($_ENV['SYMFONY_ENV'])) {
+            $file = $basePath . '/config_' . $_ENV['SYMFONY_ENV'] . '.yml';
+            if (is_file($file)) {
+                $values = Yaml::parseFile($file);
+                if (isset($values['parameters'])) {
+                    $parameters = array_merge($parameters, $values['parameters']);
+                }
             }
         }
 
         return $parameters;
     }
 
-    private function mergeSymfonyParametersFromFile($file, &$parameters)
-    {
-        if (is_file($file)) {
-            $values = Yaml::parseFile($file);
-            if (isset($values['parameters'])) {
-                $parameters = array_merge($parameters, $values['parameters']);
-            }
-        }
-    }
-
-    /**
-     * Renvoie la valeur correspondant à la clé
-     */
     public function obtenir($cle)
     {
-        return $this->_valeurs[$cle];
+        return self::$values[$cle];
     }
-
 }