--- a/mercurial/wireproto.py	Wed Jan 17 16:35:22 2018 +0100
+++ b/mercurial/wireproto.py	Wed Jan 17 16:36:23 2018 +0100
@@ -212,7 +212,9 @@
              'bundlecaps': 'scsv',
              'listkeys': 'csv',
              'cg': 'boolean',
-             'cbattempted': 'boolean'}
+             'cbattempted': 'boolean',
+             'stream': 'boolean',
+}
 
 # client side