--- a/tests/test-check-interfaces.py	Fri Feb 19 11:07:10 2021 +0100
+++ b/tests/test-check-interfaces.py	Thu Feb 18 17:36:52 2021 +0100
@@ -276,6 +276,7 @@
         flags=b'',
         baserevisionsize=None,
         revision=b'',
+        sidedata=b'',
         delta=None,
     )
     checkzobject(rd)