diff --git a/lib/timecost.rb b/lib/timecost.rb
index 107d9fb..3775e42 100644
--- a/lib/timecost.rb
+++ b/lib/timecost.rb
@@ -1,6 +1,7 @@
 
 require 'timecost/commit'
 require 'timecost/range'
-require 'timecost/rangelist'
+require 'timecost/author_list'
+require 'timecost/range_list'
 require 'timecost/cli'