diff --git a/src/Symfony/Component/Console/Input/ArgvInput.php b/src/Symfony/Component/Console/Input/ArgvInput.php
index 119be49170853..348d6760b8238 100644
--- a/src/Symfony/Component/Console/Input/ArgvInput.php
+++ b/src/Symfony/Component/Console/Input/ArgvInput.php
@@ -145,7 +145,7 @@ private function parseLongOption($token)
         $name = substr($token, 2);
 
         if (false !== $pos = strpos($name, '=')) {
-            if (0 === strlen($value = substr($name, $pos + 1))) {
+            if ('' === $value = substr($name, $pos + 1)) {
                 array_unshift($this->parsed, null);
             }
             $this->addLongOption(substr($name, 0, $pos), $value);