diff --git a/app/models/repository/git.rb b/app/models/repository/git.rb
index f3ea8e003..041175572 100644
--- a/app/models/repository/git.rb
+++ b/app/models/repository/git.rb
@@ -39,7 +39,9 @@ class Repository::Git < Repository
   end
 
   def commits(authors, start_date, end_date)
-    scm.commits(authors, start_date, end_date)
+    scm.commits(authors, start_date, end_date).map {|commit|
+      [commit[:author], commit[:num]]
+    }
   end
 
   def report_last_commit