diff --git a/setup.cfg b/setup.cfg
index 328d1896..f476afa3 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -22,6 +22,9 @@ ignore = *.rej
 filename =
     *.py
     ./linkchecker
+extend-exclude =
+    build/
+    _LinkChecker_configdata.py
 builtins =
     _
     _n