diff --git a/lib/Twig/NodeVisitor/Optimizer.php b/lib/Twig/NodeVisitor/Optimizer.php
index 87b38e241..a683f4a2a 100644
--- a/lib/Twig/NodeVisitor/Optimizer.php
+++ b/lib/Twig/NodeVisitor/Optimizer.php
@@ -37,9 +37,7 @@ class Twig_NodeVisitor_Optimizer implements Twig_NodeVisitorInterface
      */
     public function __construct($optimizers = -1)
     {
-        if (null === $optimizers) {
-            $mode = self::OPTIMIZE_ALL;
-        } elseif (!is_int($optimizers) || $optimizers > 2) {
+        if (!is_int($optimizers) || $optimizers > 2) {
             throw new InvalidArgumentException(sprintf('Optimizer mode "%s" is not valid.', $optimizers));
         }