diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddFormGuessersPass.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddFormGuessersPass.php
index 5431798e10..3795eb13d1 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddFormGuessersPass.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddFormGuessersPass.php
@@ -35,6 +35,6 @@ class AddFormGuessersPass implements CompilerPassInterface
             $guessers[] = new Reference($serviceId);
         }
 
-        $container->getDefinition('form.factory')->setArgument(1, $guessers);
+        $container->getDefinition('form.factory')->replaceArgument(1, $guessers);
     }
 }
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddFormTypesPass.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddFormTypesPass.php
index edd23e2f9b..43e0a5d8b4 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddFormTypesPass.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddFormTypesPass.php
@@ -41,6 +41,6 @@ class AddFormTypesPass implements CompilerPassInterface
             $types[$alias] = $serviceId;
         }
 
-        $container->getDefinition('form.type.loader')->setArgument(1, $types);
+        $container->getDefinition('form.type.loader')->replaceArgument(1, $types);
     }
 }
\ No newline at end of file