diff --git a/lib/retry_util.py b/lib/retry_util.py
index 6b17c92..190b402 100644
--- a/lib/retry_util.py
+++ b/lib/retry_util.py
@@ -377,7 +377,7 @@
   Raises:
     DownloadError: Whenever curl fails for any reason.
   """
-  cmd = ['curl'] + curl_args
+  cmd = ['curl', '--http1.1'] + curl_args
 
   # These values were discerned via scraping the curl manpage; they're all
   # retry related (dns failed, timeout occurred, etc, see  the manpage for