diff --git a/app/models/facebook_user_info.rb b/app/models/facebook_user_info.rb
index b0c0a8123db..8ef00720e4e 100644
--- a/app/models/facebook_user_info.rb
+++ b/app/models/facebook_user_info.rb
@@ -9,7 +9,7 @@ end
 #  id               :integer          not null, primary key
 #  user_id          :integer          not null
 #  facebook_user_id :integer          not null
-#  username         :string(255)      not null
+#  username         :string(255)
 #  first_name       :string(255)
 #  last_name        :string(255)
 #  email            :string(255)
@@ -24,4 +24,3 @@ end
 #  index_facebook_user_infos_on_facebook_user_id  (facebook_user_id) UNIQUE
 #  index_facebook_user_infos_on_user_id           (user_id) UNIQUE
 #
-
diff --git a/db/migrate/20140320042653_facebook_user_infos_username_can_be_nil.rb b/db/migrate/20140320042653_facebook_user_infos_username_can_be_nil.rb
new file mode 100644
index 00000000000..358467203b3
--- /dev/null
+++ b/db/migrate/20140320042653_facebook_user_infos_username_can_be_nil.rb
@@ -0,0 +1,5 @@
+class FacebookUserInfosUsernameCanBeNil < ActiveRecord::Migration
+  def change
+    change_column "facebook_user_infos", :username, :string, null: true
+  end
+end