diff --git a/src/Symfony/Component/HttpKernel/Fragment/InlineFragmentRenderer.php b/src/Symfony/Component/HttpKernel/Fragment/InlineFragmentRenderer.php
index a4dab4c7d05d..c06ee7a8dd14 100644
--- a/src/Symfony/Component/HttpKernel/Fragment/InlineFragmentRenderer.php
+++ b/src/Symfony/Component/HttpKernel/Fragment/InlineFragmentRenderer.php
@@ -54,6 +54,12 @@ public function render($uri, Request $request, array $options = array())
             // below instead)
             $attributes = $reference->attributes;
             $reference->attributes = array();
+
+            // Except "_format" attribute
+            if (isset($attributes['_format'])) {
+                $reference->attributes['_format'] = $attributes['_format'];  
+            }
+
             $uri = $this->generateFragmentUri($uri, $request);
             $reference->attributes = array_merge($attributes, $reference->attributes);
         }