diff --git a/src/Wallabag/ApiBundle/Resources/config/routing_rest.yml b/src/Wallabag/ApiBundle/Resources/config/routing_rest.yml
index 5f43f9716..9aef7e8ec 100644
--- a/src/Wallabag/ApiBundle/Resources/config/routing_rest.yml
+++ b/src/Wallabag/ApiBundle/Resources/config/routing_rest.yml
@@ -2,3 +2,5 @@ entries:
   type: rest
   resource:     "WallabagApiBundle:WallabagRest"
   name_prefix:  api_
+  requirements:
+    _format: xml|json|html|epub