diff --git a/src/Symfony/Component/Validator/MetadataInterface.php b/src/Symfony/Component/Validator/MetadataInterface.php
index 60abfeb42a9f0..b78e0e20721e7 100644
--- a/src/Symfony/Component/Validator/MetadataInterface.php
+++ b/src/Symfony/Component/Validator/MetadataInterface.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Validator;
 
+trigger_error('Symfony\Component\Validator\MetadataInterface was deprecated in version 2.5 and will be removed in 3.0. Use Symfony\Component\Validator\Mapping\MetadataInterface instead.', E_USER_DEPRECATED);
+
 /**
  * A container for validation metadata.
  *