--- a/python/mozbuild/mozbuild/mach_commands.py
+++ b/python/mozbuild/mozbuild/mach_commands.py
@@ -1832,16 +1832,17 @@ class PackageFrontend(MachCommandBase):
                      'Downloading {name}')
             valid = False
             # sleeptime is 60 per retry.py, used by tooltool_wrapper.sh
             for attempt, _ in enumerate(redo.retrier(attempts=retry+1,
                                                      sleeptime=60)):
                 try:
                     record.fetch_with(cache)
                 except (requests.exceptions.HTTPError,
+                        requests.exceptions.ChunkedEncodingError,
                         requests.exceptions.ConnectionError) as e:
 
                     if isinstance(e, requests.exceptions.ConnectionError):
                         should_retry = True
                     else:
                         # The relengapi proxy likes to return error 400 bad request
                         # which seems improbably to be due to our (simple) GET
                         # being borked.