diff --git a/server_files/config.php b/server_files/config.php
index 056262b..98b892a 100644
--- a/server_files/config.php
+++ b/server_files/config.php
@@ -3,19 +3,19 @@
  * Config options
  */
 
-$YEAR = $_ENV["CORRES2MATH_YEAR"];
-$URL_BASE = $_ENV["CORRES2MATH_URL_BASE"];
-$LOCAL_PATH = $_ENV["CORRES2MATH_LOCAL_PATH"];
-$MAIL_DOMAIN = $_ENV["CORRES2MATH_MAIL_DOMAIN"];
+$YEAR = getenv("CORRES2MATH_YEAR");
+$URL_BASE = getenv("CORRES2MATH_URL_BASE");
+$LOCAL_PATH = getenv("CORRES2MATH_LOCAL_PATH");
+$MAIL_DOMAIN = getenv("CORRES2MATH_MAIL_DOMAIN");
 
 /**
 * DB infos
 */
 
-$DB_HOST = $_ENV["CORRES2MATH_DB_HOST"];
-$DB_NAME = $_ENV["CORRES2MATH_DB_NAME"];
-$DB_USER = $_ENV["CORRES2MATH_DB_USER"];
-$DB_PASSWORD = $_ENV["CORRES2MATH_DB_PASSWORD"];
+$DB_HOST = getenv("CORRES2MATH_DB_HOST");
+$DB_NAME = getenv("CORRES2MATH_DB_NAME");
+$DB_USER = getenv("CORRES2MATH_DB_USER");
+$DB_PASSWORD = getenv("CORRES2MATH_DB_PASSWORD");
 
 try {
 	$DB = new PDO("mysql:host=$DB_HOST;dbname=$DB_NAME;charset=utf8", "$DB_USER", "$DB_PASSWORD", array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));