diff --git a/scrapy/core/downloader/handlers/http11.py b/scrapy/core/downloader/handlers/http11.py
index 28666185a..4fe5bb9be 100644
--- a/scrapy/core/downloader/handlers/http11.py
+++ b/scrapy/core/downloader/handlers/http11.py
@@ -148,5 +148,7 @@ class _ResponseReader(protocol.Protocol):
         body = self._bodybuf.getvalue()
         if reason.check(ResponseDone):
             self._finished.callback((self._txresponse, body, None))
+        elif reason.check(PotentialDataLoss):
+            self._finished.callback((self._txresponse, body, ['partial']))
         else:
             self._finished.errback(reason)