diff --git a/src/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php b/src/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php
index 1a5c68c04a..549b154f62 100644
--- a/src/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php
+++ b/src/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php
@@ -97,6 +97,7 @@ EOF;
     public function getProxyCode(Definition $definition)
     {
         $code = $this->classGenerator->generate($this->generateProxyClass($definition));
+        $code = preg_replace('/^(class [^ ]++ extends )([^\\\\])/', '$1\\\\$2', $code);
 
         $code = preg_replace(
             '/(\$this->initializer[0-9a-f]++) && \1->__invoke\(\$this->(valueHolder[0-9a-f]++), (.*?), \1\);/',
diff --git a/src/Symfony/Bridge/ProxyManager/Tests/LazyProxy/Fixtures/php/lazy_service_structure.txt b/src/Symfony/Bridge/ProxyManager/Tests/LazyProxy/Fixtures/php/lazy_service_structure.txt
index 574041b89b..906fff68f7 100644
--- a/src/Symfony/Bridge/ProxyManager/Tests/LazyProxy/Fixtures/php/lazy_service_structure.txt
+++ b/src/Symfony/Bridge/ProxyManager/Tests/LazyProxy/Fixtures/php/lazy_service_structure.txt
@@ -21,5 +21,5 @@ class LazyServiceProjectServiceContainer extends Container
     }
 }
 
-class stdClass_%s extends %SstdClass implements \ProxyManager\%s
+class stdClass_%s extends \stdClass implements \ProxyManager\%s
 {%a}%A