diff --git a/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php b/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php
index 11d8f34d5a..24505add17 100644
--- a/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php
+++ b/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php
@@ -120,7 +120,7 @@ abstract class AnnotationClassLoader implements LoaderInterface
 
         $class = new \ReflectionClass($class);
         if ($class->isAbstract()) {
-            throw new \InvalidArgumentException(sprintf('Annotations from class "%s" cannot be read as it is abstract.', $class));
+            throw new \InvalidArgumentException(sprintf('Annotations from class "%s" cannot be read as it is abstract.', $class->getName()));
         }
 
         if ($annot = $this->reader->getClassAnnotation($class, $this->routeAnnotationClass)) {