diff --git a/src/Symfony/Component/Validator/ClassBasedInterface.php b/src/Symfony/Component/Validator/ClassBasedInterface.php
index fe532efe5170..770f0a98767d 100644
--- a/src/Symfony/Component/Validator/ClassBasedInterface.php
+++ b/src/Symfony/Component/Validator/ClassBasedInterface.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Validator;
 
+trigger_error('The Symfony\Component\Validator\ClassBasedInterface interface was deprecated in version 2.7 and will be removed in 3.0. Use Symfony\Component\Validator\Mapping\ClassMetadataInterface instead', E_USER_DEPRECATED);
+
 /**
  * An object backed by a PHP class.
  *