diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/config/validator.xml b/src/Symfony/Bundle/FrameworkBundle/Resources/config/validator.xml
index f2d0e9e2a603..886132ff4b1c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/config/validator.xml
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/config/validator.xml
@@ -5,7 +5,6 @@
     xsi:schemaLocation="http://symfony.com/schema/dic/services https://symfony.com/schema/dic/services/services-1.0.xsd">
 
     <parameters>
-        <parameter key="validator.mapping.cache.prefix" />
         <parameter key="validator.mapping.cache.file">%kernel.cache_dir%/validation.php</parameter>
     </parameters>