diff --git a/scrapy/spider/middleware.py b/scrapy/spider/middleware.py
index 913c9a065..85af03c2a 100644
--- a/scrapy/spider/middleware.py
+++ b/scrapy/spider/middleware.py
@@ -81,7 +81,7 @@ class SpiderMiddlewareManager(object):
                     'Middleware %s must returns an iterable object, got %s ' % \
                     (fname(method), type(result))
 
-            return self._validate_output(request, result)
+            return self._validate_output(request, result, spider)
 
         dfd = mustbe_deferred(process_spider_input, response)
         dfd.addErrback(process_spider_exception)
@@ -93,14 +93,14 @@ class SpiderMiddlewareManager(object):
         request.deferred.addCallback(arg_to_iter)
         return request.deferred
 
-    def _validate_output(self, request, result):
+    def _validate_output(self, request, result, spider):
         """Every request returned by spiders must be instanciate with a callback"""
         for r in result:
             if isinstance(r, Request) and not r.deferred.callbacks:
                 log.msg('Ignoring %s returned from spider while processing %s: ' \
                         'Request has no callback, try adding callback=self.parse ' \
                         'argument when instanciating Request objects inside your spiders' \
-                        % (r, request), level=log.WARNING)
+                        % (r, request), level=log.WARNING, domain=spider.domain_name)
                 continue
             yield r