--- a/hgext/rebase.py	Tue Sep 28 13:59:01 2021 -0700
+++ b/hgext/rebase.py	Tue Sep 28 15:11:22 2021 -0700
@@ -1323,7 +1323,7 @@
             return None
         if destf:
             # --base does not support multiple destinations
-            dest = scmutil.revsingle(repo, destf)
+            dest = logcmdutil.revsingle(repo, destf)
         else:
             dest = repo[_destrebase(repo, base, destspace=destspace)]
             destf = bytes(dest)