diff --git a/hgext/fastannotate/__init__.py b/hgext/fastannotate/__init__.py
--- a/hgext/fastannotate/__init__.py
+++ b/hgext/fastannotate/__init__.py
@@ -117,7 +117,6 @@
     error as hgerror,
     localrepo,
     registrar,
-    util,
 )
 
 from . import (
diff --git a/hgext/fastannotate/protocol.py b/hgext/fastannotate/protocol.py
--- a/hgext/fastannotate/protocol.py
+++ b/hgext/fastannotate/protocol.py
@@ -15,7 +15,6 @@
     extensions,
     hg,
     localrepo,
-    scmutil,
     wireprotov1peer,
     wireprotov1server,
 )
@@ -188,8 +187,6 @@
     if threshold <= 0:
         return paths
 
-    master = repo.ui.config('fastannotate', 'mainbranch') or 'default'
-
     result = []
     for path in paths:
         try: