diff --git a/src/Symfony/Component/DependencyInjection/CHANGELOG.md b/src/Symfony/Component/DependencyInjection/CHANGELOG.md
index 96839e9660..d12f23674c 100644
--- a/src/Symfony/Component/DependencyInjection/CHANGELOG.md
+++ b/src/Symfony/Component/DependencyInjection/CHANGELOG.md
@@ -10,3 +10,6 @@ CHANGELOG
  * added Definition::clearTag()
  * component exceptions that inherit base SPL classes are now used exclusively
    (this includes dumped containers)
+ * [BC BREAK] fixed unescaping of class arguments, method ParameterBag::unescapeValue() was made
+   public
+
diff --git a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
index a706229db4..223ceead35 100644
--- a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
+++ b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
@@ -728,24 +728,28 @@ class ContainerBuilder extends Container implements TaggedContainerInterface
      */
     private function createService(Definition $definition, $id)
     {
+        $parameterBag = $this->getParameterBag();
+
         if (null !== $definition->getFile()) {
-            require_once $this->getParameterBag()->resolveValue($definition->getFile());
+            require_once $parameterBag->resolveValue($definition->getFile());
         }
 
-        $arguments = $this->resolveServices($this->getParameterBag()->resolveValue($definition->getArguments()));
+        $arguments = $this->resolveServices(
+            $parameterBag->unescapeValue($parameterBag->resolveValue($definition->getArguments()))
+        );
 
         if (null !== $definition->getFactoryMethod()) {
             if (null !== $definition->getFactoryClass()) {
-                $factory = $this->getParameterBag()->resolveValue($definition->getFactoryClass());
+                $factory = $parameterBag->resolveValue($definition->getFactoryClass());
             } elseif (null !== $definition->getFactoryService()) {
-                $factory = $this->get($this->getParameterBag()->resolveValue($definition->getFactoryService()));
+                $factory = $this->get($parameterBag->resolveValue($definition->getFactoryService()));
             } else {
                 throw new RuntimeException('Cannot create service from factory method without a factory service or factory class.');
             }
 
             $service = call_user_func_array(array($factory, $definition->getFactoryMethod()), $arguments);
         } else {
-            $r = new \ReflectionClass($this->getParameterBag()->resolveValue($definition->getClass()));
+            $r = new \ReflectionClass($parameterBag->resolveValue($definition->getClass()));
 
             $service = null === $r->getConstructor() ? $r->newInstance() : $r->newInstanceArgs($arguments);
         }
@@ -774,11 +778,11 @@ class ContainerBuilder extends Container implements TaggedContainerInterface
             }
 
             if ($ok) {
-                call_user_func_array(array($service, $call[0]), $this->resolveServices($this->getParameterBag()->resolveValue($call[1])));
+                call_user_func_array(array($service, $call[0]), $this->resolveServices($parameterBag->resolveValue($call[1])));
             }
         }
 
-        $properties = $this->resolveServices($this->getParameterBag()->resolveValue($definition->getProperties()));
+        $properties = $this->resolveServices($parameterBag->resolveValue($definition->getProperties()));
         foreach ($properties as $name => $value) {
             $service->$name = $value;
         }
@@ -787,7 +791,7 @@ class ContainerBuilder extends Container implements TaggedContainerInterface
             if (is_array($callable) && is_object($callable[0]) && $callable[0] instanceof Reference) {
                 $callable[0] = $this->get((string) $callable[0]);
             } elseif (is_array($callable)) {
-                $callable[0] = $this->getParameterBag()->resolveValue($callable[0]);
+                $callable[0] = $parameterBag->resolveValue($callable[0]);
             }
 
             if (!is_callable($callable)) {
diff --git a/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php b/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
index ad8dc489a4..908e2a146f 100644
--- a/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
+++ b/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
@@ -274,7 +274,7 @@ class ParameterBag implements ParameterBagInterface
         return $value;
     }
 
-    private function unescapeValue($value)
+    public function unescapeValue($value)
     {
         if (is_string($value)) {
             return str_replace('%%', '%', $value);
diff --git a/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBagInterface.php b/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBagInterface.php
index 4ad6aed2c8..a9a4f02261 100644
--- a/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBagInterface.php
+++ b/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBagInterface.php
@@ -103,4 +103,13 @@ interface ParameterBagInterface
      * @return mixed
      */
     function escapeValue($value);
+
+    /**
+     * Unescape parameter placeholders %
+     *
+     * @param mixed $value
+     *
+     * @return mixed
+     */
+    function unescapeValue($value);
 }
diff --git a/src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php b/src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php
index bedcecb7fc..4d650f9b87 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php
@@ -251,9 +251,9 @@ class ContainerBuilderTest extends \PHPUnit_Framework_TestCase
     {
         $builder = new ContainerBuilder();
         $builder->register('bar', 'stdClass');
-        $builder->register('foo1', 'FooClass')->addArgument(array('foo' => '%value%', '%value%' => 'foo', new Reference('bar')));
+        $builder->register('foo1', 'FooClass')->addArgument(array('foo' => '%value%', '%value%' => 'foo', new Reference('bar'), '%%unescape_it%%'));
         $builder->setParameter('value', 'bar');
-        $this->assertEquals(array('foo' => 'bar', 'bar' => 'foo', $builder->get('bar')), $builder->get('foo1')->arguments, '->createService() replaces parameters and service references in the arguments provided by the service definition');
+        $this->assertEquals(array('foo' => 'bar', 'bar' => 'foo', $builder->get('bar'), '%unescape_it%'), $builder->get('foo1')->arguments, '->createService() replaces parameters and service references in the arguments provided by the service definition');
     }
 
     /**