diff --git a/app/models/mailer.rb b/app/models/mailer.rb
index 1e3995724..63fbe6ce0 100644
--- a/app/models/mailer.rb
+++ b/app/models/mailer.rb
@@ -15,8 +15,6 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-require 'ar_condition'
-
 class Mailer < ActionMailer::Base
   layout 'mailer'
   helper :application
diff --git a/lib/ar_condition.rb b/lib/ar_condition.rb
deleted file mode 100644
index 600d2d061..000000000
--- a/lib/ar_condition.rb
+++ /dev/null
@@ -1,41 +0,0 @@
-# Redmine - project management software
-# Copyright (C) 2006-2011  Jean-Philippe Lang
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
-
-class ARCondition
-  attr_reader :conditions
-
-  def initialize(condition=nil)
-    @conditions = ['1=1']
-    add(condition) if condition
-  end
-
-  def add(condition)
-    if condition.is_a?(Array)
-      @conditions.first << " AND (#{condition.first})"
-      @conditions += condition[1..-1]
-    elsif condition.is_a?(String)
-      @conditions.first << " AND (#{condition})"
-    else
-      raise "Unsupported #{condition.class} condition: #{condition}"
-    end
-    self
-  end
-
-  def <<(condition)
-    add(condition)
-  end
-end