diff --git a/scrapy/core/downloader/handlers/http11.py b/scrapy/core/downloader/handlers/http11.py
index c5552865f..a4f711cab 100644
--- a/scrapy/core/downloader/handlers/http11.py
+++ b/scrapy/core/downloader/handlers/http11.py
@@ -8,7 +8,6 @@ from zope.interface import implements
 from twisted.internet import defer, reactor, protocol
 from twisted.web.http_headers import Headers as TxHeaders
 from twisted.web.iweb import IBodyProducer
-from twisted.web.http import PotentialDataLoss
 from twisted.internet.error import TimeoutError
 from twisted.web.http import PotentialDataLoss
 from scrapy.xlib.tx import Agent, ProxyAgent, ResponseDone, \