diff --git a/scrapy/core/scheduler.py b/scrapy/core/scheduler.py
index 11b3de312..f71ef0e48 100644
--- a/scrapy/core/scheduler.py
+++ b/scrapy/core/scheduler.py
@@ -26,7 +26,7 @@ class Scheduler(object):
         return cls(dupefilter, job_dir(settings), dqclass)
 
     def has_pending_requests(self):
-        return self.dqs or self.mqs
+        return len(self.dqs) or len(self.mqs)
 
     def open(self, spider):
         self.spider = spider