diff --git a/src/NodeVisitor/OptimizerNodeVisitor.php b/src/NodeVisitor/OptimizerNodeVisitor.php
index a8478412a..c8eb1625d 100644
--- a/src/NodeVisitor/OptimizerNodeVisitor.php
+++ b/src/NodeVisitor/OptimizerNodeVisitor.php
@@ -51,7 +51,7 @@ final class OptimizerNodeVisitor implements NodeVisitorInterface
      */
     public function __construct(int $optimizers = -1)
     {
-        if (!\is_int($optimizers) || $optimizers > (self::OPTIMIZE_FOR | self::OPTIMIZE_RAW_FILTER)) {
+        if ($optimizers > (self::OPTIMIZE_FOR | self::OPTIMIZE_RAW_FILTER)) {
             throw new \InvalidArgumentException(sprintf('Optimizer mode "%s" is not valid.', $optimizers));
         }