--- a/hgext/remotefilelog/remotefilelog.py	Thu Apr 08 16:34:11 2021 +0200
+++ b/hgext/remotefilelog/remotefilelog.py	Sat Apr 10 11:27:40 2021 +0200
@@ -331,6 +331,8 @@
                 delta=delta,
                 # Sidedata is not supported yet
                 sidedata=None,
+                # Protocol flags are not used yet
+                protocol_flags=0,
             )
 
     def revdiff(self, node1, node2):