diff --git a/src/Bundle/Controller/Parameters.php b/src/Bundle/Controller/Parameters.php
index <HASH>..<HASH> 100644
--- a/src/Bundle/Controller/Parameters.php
+++ b/src/Bundle/Controller/Parameters.php
@@ -33,35 +33,15 @@ if (Kernel::MAJOR_VERSION === 6) {
             return $result;
         }
     }
-} elseif (Kernel::MAJOR_VERSION === 5) {
-    class Parameters extends ParameterBag
-    {
-        /**
-         * @param mixed $default
-         *
-         * @return mixed
-         */
-        public function get(string $key, $default = null)
-        {
-            $result = parent::get($key, $default);
-
-            if (null === $result && $default !== null && $this->has($key)) {
-                $result = $default;
-            }
-
-            return $result;
-        }
-    }
 } else {
     class Parameters extends ParameterBag
     {
         /**
-         * @param string $key
          * @param mixed $default
          *
          * @return mixed
          */
-        public function get($key, $default = null)
+        public function get(string $key, $default = null)
         {
             $result = parent::get($key, $default);
[Maintenance] Drop Sf4 ACL on parameters class due to lack of its support