diff --git a/src/Symfony/Component/OptionsResolver/OptionsResolver.php b/src/Symfony/Component/OptionsResolver/OptionsResolver.php
index 4d9653c45b..da6e43b678 100644
--- a/src/Symfony/Component/OptionsResolver/OptionsResolver.php
+++ b/src/Symfony/Component/OptionsResolver/OptionsResolver.php
@@ -252,7 +252,7 @@ class OptionsResolver implements Options, OptionsResolverInterface
             throw new AccessException('Options cannot be made required from a lazy option or normalizer.');
         }
 
-        foreach ((array) $optionNames as $key => $option) {
+        foreach ((array) $optionNames as $option) {
             $this->defined[$option] = true;
             $this->required[$option] = true;
         }
@@ -333,7 +333,7 @@ class OptionsResolver implements Options, OptionsResolverInterface
             throw new AccessException('Options cannot be defined from a lazy option or normalizer.');
         }
 
-        foreach ((array) $optionNames as $key => $option) {
+        foreach ((array) $optionNames as $option) {
             $this->defined[$option] = true;
         }