diff --git a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
index e22da19b2021..18a447afccda 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
@@ -41,7 +41,14 @@ public function collect(Request $request, Response $response, \Exception $except
 
         $attributes = array();
         foreach ($request->attributes->all() as $key => $value) {
-            $attributes[$key] = is_object($value) ? sprintf('Object(%s)', get_class($value)) : $value;
+            if (is_object($value)) {
+                $attributes[$key] = sprintf('Object(%s)', get_class($value));
+                if (is_callable(array($value, '__toString')) {
+                    $attributes[$key] .= sprintf(' = %s', (string) $value);
+                }
+            } else {
+                $attributes[$key] = $value;
+            }
         }
 
         $content = null;