diff --git a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
index 6c52c47b65..3a72208c3e 100644
--- a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
+++ b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
@@ -243,7 +243,9 @@ class ContainerBuilder extends Container implements TaggedContainerInterface
         }
 
         do {
-            $this->addResource(new FileResource($class->getFileName()));
+            if (is_file($class->getFileName())) {
+                $this->addResource(new FileResource($class->getFileName()));
+            }
         } while ($class = $class->getParentClass());
 
         return $this;
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/bar.xml b/src/Symfony/Component/Routing/Tests/Fixtures/bar.xml
new file mode 100644
index 0000000000..e69de29bb2