diff --git a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
index 00c5ccf462..102033ce6d 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
@@ -564,9 +564,7 @@ EOF;
             if ($callable[0] instanceof Reference
                 || ($callable[0] instanceof Definition && $this->definitionVariables->contains($callable[0]))
             ) {
-                $callable[0] = $this->dumpValue($callable[0]);
-
-                return sprintf('        '.('$' === $callable[0][0] ? '%s' : '(%s)')."->%s(\$%s);\n", $callable[0], $callable[1], $variableName);
+                return sprintf("        %s->%s(\$%s);\n", $this->dumpValue($callable[0]), $callable[1], $variableName);
             }
 
             $class = $this->dumpValue($callable[0]);
@@ -1610,6 +1608,7 @@ EOF;
                 if ($definition->isShared()) {
                     $code = sprintf('$this->%s[\'%s\'] = %s', $definition->isPublic() ? 'services' : 'privates', $id, $code);
                 }
+                $code = "($code)";
             } elseif ($this->asFiles && !$this->isHotPath($definition)) {
                 $code = sprintf("\$this->load('%s.php')", $this->generateMethodName($id));
                 if (!$definition->isShared()) {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php b/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
index 962137e73d..fa4e42017e 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
@@ -792,7 +792,7 @@ class PhpDumperTest extends TestCase
             ->setPublic(false);
         $container->register('public_foo', 'stdClass')
             ->setPublic(true)
-            ->addArgument(new Expression('service("private_foo")'));
+            ->addArgument(new Expression('service("private_foo").bar'));
 
         $container->compile();
         $dumper = new PhpDumper($container);
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_as_files.txt b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_as_files.txt
index 7f9c5cec28..fba001613d 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_as_files.txt
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_as_files.txt
@@ -347,7 +347,7 @@ use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 
 return $this->services['tagged_iterator'] = new \Bar(new RewindableGenerator(function () {
     yield 0 => ($this->services['foo'] ?? $this->load('getFooService.php'));
-    yield 1 => ($this->privates['tagged_iterator_foo'] ?? $this->privates['tagged_iterator_foo'] = new \Bar());
+    yield 1 => ($this->privates['tagged_iterator_foo'] ?? ($this->privates['tagged_iterator_foo'] = new \Bar()));
 }, 2));
 
     [Container%s/getTaggedIteratorFooService.php] => <?php
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php
index 407a908d95..417480652f 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php
@@ -402,7 +402,7 @@ class ProjectServiceContainer extends Container
     {
         return $this->services['tagged_iterator'] = new \Bar(new RewindableGenerator(function () {
             yield 0 => ($this->services['foo'] ?? $this->getFooService());
-            yield 1 => ($this->privates['tagged_iterator_foo'] ?? $this->privates['tagged_iterator_foo'] = new \Bar());
+            yield 1 => ($this->privates['tagged_iterator_foo'] ?? ($this->privates['tagged_iterator_foo'] = new \Bar()));
         }, 2));
     }
 
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_almost_circular_public.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_almost_circular_public.php
index 7923ae879f..1a14c5d4d6 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_almost_circular_public.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_almost_circular_public.php
@@ -114,7 +114,7 @@ class Symfony_DI_PhpDumper_Test_Almost_Circular_Public extends Container
     {
         $this->services['bar3'] = $instance = new \BarCircular();
 
-        $a = ($this->services['foobar3'] ?? $this->services['foobar3'] = new \FoobarCircular());
+        $a = ($this->services['foobar3'] ?? ($this->services['foobar3'] = new \FoobarCircular()));
 
         $instance->addFoobar($a, $a);
 
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_env_in_id.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_env_in_id.php
index 93063503bd..4b914f206f 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_env_in_id.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_env_in_id.php
@@ -70,7 +70,7 @@ class ProjectServiceContainer extends Container
      */
     protected function getBarService()
     {
-        return $this->services['bar'] = new \stdClass(($this->privates['bar_%env(BAR)%'] ?? $this->privates['bar_%env(BAR)%'] = new \stdClass()));
+        return $this->services['bar'] = new \stdClass(($this->privates['bar_%env(BAR)%'] ?? ($this->privates['bar_%env(BAR)%'] = new \stdClass())));
     }
 
     /**
@@ -80,7 +80,7 @@ class ProjectServiceContainer extends Container
      */
     protected function getFooService()
     {
-        return $this->services['foo'] = new \stdClass(($this->privates['bar_%env(BAR)%'] ?? $this->privates['bar_%env(BAR)%'] = new \stdClass()), array('baz_'.$this->getEnv('string:BAR') => new \stdClass()));
+        return $this->services['foo'] = new \stdClass(($this->privates['bar_%env(BAR)%'] ?? ($this->privates['bar_%env(BAR)%'] = new \stdClass())), array('baz_'.$this->getEnv('string:BAR') => new \stdClass()));
     }
 
     public function getParameter($name)
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_errored_definition.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_errored_definition.php
index c3351a208c..c5b90d19b2 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_errored_definition.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_errored_definition.php
@@ -402,7 +402,7 @@ class Symfony_DI_PhpDumper_Errored_Definition extends Container
     {
         return $this->services['tagged_iterator'] = new \Bar(new RewindableGenerator(function () {
             yield 0 => ($this->services['foo'] ?? $this->getFooService());
-            yield 1 => ($this->privates['tagged_iterator_foo'] ?? $this->privates['tagged_iterator_foo'] = new \Bar());
+            yield 1 => ($this->privates['tagged_iterator_foo'] ?? ($this->privates['tagged_iterator_foo'] = new \Bar()));
         }, 2));
     }
 
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_locator.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_locator.php
index 59bbce3a99..c705797921 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_locator.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_locator.php
@@ -76,7 +76,7 @@ class ProjectServiceContainer extends Container
      */
     protected function getBarServiceService()
     {
-        return $this->services['bar_service'] = new \stdClass(($this->privates['baz_service'] ?? $this->privates['baz_service'] = new \stdClass()));
+        return $this->services['bar_service'] = new \stdClass(($this->privates['baz_service'] ?? ($this->privates['baz_service'] = new \stdClass())));
     }
 
     /**
@@ -89,7 +89,7 @@ class ProjectServiceContainer extends Container
         return $this->services['foo_service'] = new \Symfony\Component\DependencyInjection\ServiceLocator(array('bar' => function () {
             return ($this->services['bar_service'] ?? $this->getBarServiceService());
         }, 'baz' => function (): \stdClass {
-            return ($this->privates['baz_service'] ?? $this->privates['baz_service'] = new \stdClass());
+            return ($this->privates['baz_service'] ?? ($this->privates['baz_service'] = new \stdClass()));
         }, 'nil' => function () {
             return NULL;
         }));
@@ -133,7 +133,7 @@ class ProjectServiceContainer extends Container
     protected function getTranslator1Service()
     {
         return $this->services['translator_1'] = new \Symfony\Component\DependencyInjection\Tests\Fixtures\StubbedTranslator(new \Symfony\Component\DependencyInjection\ServiceLocator(array('translator.loader_1' => function () {
-            return ($this->services['translator.loader_1'] ?? $this->services['translator.loader_1'] = new \stdClass());
+            return ($this->services['translator.loader_1'] ?? ($this->services['translator.loader_1'] = new \stdClass()));
         })));
     }
 
@@ -145,10 +145,10 @@ class ProjectServiceContainer extends Container
     protected function getTranslator2Service()
     {
         $this->services['translator_2'] = $instance = new \Symfony\Component\DependencyInjection\Tests\Fixtures\StubbedTranslator(new \Symfony\Component\DependencyInjection\ServiceLocator(array('translator.loader_2' => function () {
-            return ($this->services['translator.loader_2'] ?? $this->services['translator.loader_2'] = new \stdClass());
+            return ($this->services['translator.loader_2'] ?? ($this->services['translator.loader_2'] = new \stdClass()));
         })));
 
-        $instance->addResource('db', ($this->services['translator.loader_2'] ?? $this->services['translator.loader_2'] = new \stdClass()), 'nl');
+        $instance->addResource('db', ($this->services['translator.loader_2'] ?? ($this->services['translator.loader_2'] = new \stdClass())), 'nl');
 
         return $instance;
     }
@@ -161,10 +161,10 @@ class ProjectServiceContainer extends Container
     protected function getTranslator3Service()
     {
         $this->services['translator_3'] = $instance = new \Symfony\Component\DependencyInjection\Tests\Fixtures\StubbedTranslator(new \Symfony\Component\DependencyInjection\ServiceLocator(array('translator.loader_3' => function () {
-            return ($this->services['translator.loader_3'] ?? $this->services['translator.loader_3'] = new \stdClass());
+            return ($this->services['translator.loader_3'] ?? ($this->services['translator.loader_3'] = new \stdClass()));
         })));
 
-        $a = ($this->services['translator.loader_3'] ?? $this->services['translator.loader_3'] = new \stdClass());
+        $a = ($this->services['translator.loader_3'] ?? ($this->services['translator.loader_3'] = new \stdClass()));
 
         $instance->addResource('db', $a, 'nl');
         $instance->addResource('db', $a, 'en');
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_frozen.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_frozen.php
index 86315e2eba..7a55fab633 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_frozen.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_frozen.php
@@ -67,7 +67,7 @@ class ProjectServiceContainer extends Container
      */
     protected function getBarServiceService()
     {
-        return $this->services['bar_service'] = new \stdClass(($this->privates['baz_service'] ?? $this->privates['baz_service'] = new \stdClass()));
+        return $this->services['bar_service'] = new \stdClass(($this->privates['baz_service'] ?? ($this->privates['baz_service'] = new \stdClass())));
     }
 
     /**
@@ -77,6 +77,6 @@ class ProjectServiceContainer extends Container
      */
     protected function getFooServiceService()
     {
-        return $this->services['foo_service'] = new \stdClass(($this->privates['baz_service'] ?? $this->privates['baz_service'] = new \stdClass()));
+        return $this->services['foo_service'] = new \stdClass(($this->privates['baz_service'] ?? ($this->privates['baz_service'] = new \stdClass())));
     }
 }
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_in_expression.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_in_expression.php
index 5caf9104dd..0e9686f0f5 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_in_expression.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_in_expression.php
@@ -67,6 +67,6 @@ class ProjectServiceContainer extends Container
      */
     protected function getPublicFooService()
     {
-        return $this->services['public_foo'] = new \stdClass(($this->privates['private_foo'] ?? $this->privates['private_foo'] = new \stdClass()));
+        return $this->services['public_foo'] = new \stdClass(($this->privates['private_foo'] ?? ($this->privates['private_foo'] = new \stdClass()))->bar);
     }
 }
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_rot13_env.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_rot13_env.php
index 76ce9e5532..12fc940a46 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_rot13_env.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_rot13_env.php
@@ -79,7 +79,7 @@ class Symfony_DI_PhpDumper_Test_Rot13Parameters extends Container
     protected function getContainer_EnvVarProcessorsLocatorService()
     {
         return $this->services['container.env_var_processors_locator'] = new \Symfony\Component\DependencyInjection\ServiceLocator(array('rot13' => function () {
-            return ($this->services['Symfony\Component\DependencyInjection\Tests\Dumper\Rot13EnvVarProcessor'] ?? $this->services['Symfony\Component\DependencyInjection\Tests\Dumper\Rot13EnvVarProcessor'] = new \Symfony\Component\DependencyInjection\Tests\Dumper\Rot13EnvVarProcessor());
+            return ($this->services['Symfony\Component\DependencyInjection\Tests\Dumper\Rot13EnvVarProcessor'] ?? ($this->services['Symfony\Component\DependencyInjection\Tests\Dumper\Rot13EnvVarProcessor'] = new \Symfony\Component\DependencyInjection\Tests\Dumper\Rot13EnvVarProcessor()));
         }));
     }
 
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_subscriber.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_subscriber.php
index 2c887e0e21..bc19940bb3 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_subscriber.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_subscriber.php
@@ -80,13 +80,13 @@ class ProjectServiceContainer extends Container
     protected function getFooServiceService()
     {
         return $this->services['foo_service'] = new \Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber((new \Symfony\Component\DependencyInjection\ServiceLocator(array('Symfony\\Component\\DependencyInjection\\Tests\\Fixtures\\CustomDefinition' => function (): ?\Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition {
-            return ($this->privates['Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition'] ?? $this->privates['Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition'] = new \Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition());
+            return ($this->privates['Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition'] ?? ($this->privates['Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition'] = new \Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition()));
         }, 'Symfony\\Component\\DependencyInjection\\Tests\\Fixtures\\TestServiceSubscriber' => function (): \Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber {
-            return ($this->services['Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber'] ?? $this->services['Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber'] = new \Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber());
+            return ($this->services['Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber'] ?? ($this->services['Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber'] = new \Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber()));
         }, 'bar' => function (): \Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition {
-            return ($this->services['Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber'] ?? $this->services['Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber'] = new \Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber());
+            return ($this->services['Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber'] ?? ($this->services['Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber'] = new \Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber()));
         }, 'baz' => function (): ?\Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition {
-            return ($this->privates['Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition'] ?? $this->privates['Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition'] = new \Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition());
+            return ($this->privates['Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition'] ?? ($this->privates['Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition'] = new \Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition()));
         })))->withContext('foo_service', $this));
     }
 }
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_uninitialized_ref.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_uninitialized_ref.php
index 0f5090c80b..a2fe59acdf 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_uninitialized_ref.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_uninitialized_ref.php
@@ -107,7 +107,7 @@ class Symfony_DI_PhpDumper_Test_Uninitialized_Reference extends Container
     {
         $this->services['baz'] = $instance = new \stdClass();
 
-        $instance->foo3 = ($this->privates['foo3'] ?? $this->privates['foo3'] = new \stdClass());
+        $instance->foo3 = ($this->privates['foo3'] ?? ($this->privates['foo3'] = new \stdClass()));
 
         return $instance;
     }