diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveChildDefinitionsPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveChildDefinitionsPass.php
index 99c374ee492f2..333480d66683c 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveChildDefinitionsPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveChildDefinitionsPass.php
@@ -114,6 +114,8 @@ private function doResolveDefinition(ChildDefinition $definition): Definition
 
         $def->setBindings($definition->getBindings() + $parentDef->getBindings());
 
+        $def->setSynthetic($definition->isSynthetic());
+
         // overwrite with values specified in the decorator
         $changes = $definition->getChanges();
         if (isset($changes['class'])) {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveChildDefinitionsPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveChildDefinitionsPassTest.php
index f14cbb01968b9..7a89feb9b7659 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveChildDefinitionsPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveChildDefinitionsPassTest.php
@@ -412,4 +412,21 @@ public function testProcessDetectsChildDefinitionIndirectCircularReference()
 
         $this->process($container);
     }
+
+    public function testProcessCopiesSyntheticStatus()
+    {
+        $container = new ContainerBuilder();
+
+        $container->register('parent');
+
+        $container
+            ->setDefinition('child', new ChildDefinition('parent'))
+            ->setSynthetic(true)
+        ;
+
+        $this->process($container);
+
+        $def = $container->getDefinition('child');
+        $this->assertTrue($def->isSynthetic());
+    }
 }