diff --git a/scrapy/core/scheduler.py b/scrapy/core/scheduler.py
index a24b9fd73..2b167a6dc 100644
--- a/scrapy/core/scheduler.py
+++ b/scrapy/core/scheduler.py
@@ -58,9 +58,7 @@ class Scheduler(object):
         return dfd
 
     def clear_pending_requests(self, spider):
-        """Remove all pending requests for the given spider"""
-        q = self.pending_requests[spider]
-        q.clear()
+        pass
 
     def next_request(self, spider):
         """Return the next available request to be downloaded for a spider.