diff --git a/db/migrate/036_add_changeset_commit_date.rb b/db/migrate/036_add_changeset_commit_date.rb
index 50ab8ef4..b9cc49b8 100644
--- a/db/migrate/036_add_changeset_commit_date.rb
+++ b/db/migrate/036_add_changeset_commit_date.rb
@@ -1,6 +1,6 @@
 class AddChangesetCommitDate < ActiveRecord::Migration
   def self.up
-    add_column :changesets, :commit_date, :date, :null => false
+    add_column :changesets, :commit_date, :date
     Changeset.update_all "commit_date = committed_on"
   end