diff --git a/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php b/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php
index 66b995425c5a2..baef4ed8ba17d 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php
@@ -22,7 +22,7 @@
  *
  * @author Kévin Dunglas <dunglas@gmail.com>
  */
-class AutowirePass extends AbstractRecursivePass implements CompilerPassInterface
+class AutowirePass extends AbstractRecursivePass
 {
     private $reflectionClasses = array();
     private $definedTypes = array();
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php b/src/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php
index 1da5100786db3..35fb325e74964 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php
@@ -20,7 +20,7 @@
  *
  * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  */
-class CheckExceptionOnInvalidReferenceBehaviorPass extends AbstractRecursivePass implements CompilerPassInterface
+class CheckExceptionOnInvalidReferenceBehaviorPass extends AbstractRecursivePass
 {
     protected function processValue($value, $isRoot = false)
     {
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/CheckReferenceValidityPass.php b/src/Symfony/Component/DependencyInjection/Compiler/CheckReferenceValidityPass.php
index 2a8a00eda3a45..72c7dd165d4af 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/CheckReferenceValidityPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/CheckReferenceValidityPass.php
@@ -23,7 +23,7 @@
  *
  * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  */
-class CheckReferenceValidityPass extends AbstractRecursivePass implements CompilerPassInterface
+class CheckReferenceValidityPass extends AbstractRecursivePass
 {
     protected function processValue($value, $isRoot = false)
     {
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ReplaceAliasByActualDefinitionPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ReplaceAliasByActualDefinitionPass.php
index b4309d212cbe1..df668b774709e 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ReplaceAliasByActualDefinitionPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ReplaceAliasByActualDefinitionPass.php
@@ -21,7 +21,7 @@
  *
  * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  */
-class ReplaceAliasByActualDefinitionPass extends AbstractRecursivePass implements CompilerPassInterface
+class ReplaceAliasByActualDefinitionPass extends AbstractRecursivePass
 {
     private $replacements;
 
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveDefinitionTemplatesPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveDefinitionTemplatesPass.php
index ff80d332366df..7839111539d2c 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveDefinitionTemplatesPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveDefinitionTemplatesPass.php
@@ -23,7 +23,7 @@
  * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  * @author Nicolas Grekas <p@tchwork.com>
  */
-class ResolveDefinitionTemplatesPass extends AbstractRecursivePass implements CompilerPassInterface
+class ResolveDefinitionTemplatesPass extends AbstractRecursivePass
 {
     protected function processValue($value, $isRoot = false)
     {
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveParameterPlaceHoldersPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveParameterPlaceHoldersPass.php
index a0fa3ae1a5ff0..d1d6786145bad 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveParameterPlaceHoldersPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveParameterPlaceHoldersPass.php
@@ -20,7 +20,7 @@
  *
  * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  */
-class ResolveParameterPlaceHoldersPass extends AbstractRecursivePass implements CompilerPassInterface
+class ResolveParameterPlaceHoldersPass extends AbstractRecursivePass
 {
     private $bag;