diff --git a/app/helpers/custom_fields_helper.rb b/app/helpers/custom_fields_helper.rb
index 540c6b4a..3c795dc1 100644
--- a/app/helpers/custom_fields_helper.rb
+++ b/app/helpers/custom_fields_helper.rb
@@ -37,7 +37,7 @@ module CustomFieldsHelper
     when "text"
       text_area_tag(field_name, custom_value.value, :id => field_id, :rows => 3, :style => 'width:90%')
     when "bool"
-      check_box_tag(field_name, custom_value.value, :id => field_id)
+      check_box_tag(field_name, '1', custom_value.true?, :id => field_id) + hidden_field_tag(field_name, '0')
     when "list"
       blank_option = custom_field.is_required? ?
                        (custom_field.default_value.blank? ? "<option value=\"\">--- #{l(:actionview_instancetag_blank_option)} ---</option>" : '') : 
diff --git a/app/models/custom_value.rb b/app/models/custom_value.rb
index 98ce6b16..1d453baf 100644
--- a/app/models/custom_value.rb
+++ b/app/models/custom_value.rb
@@ -25,6 +25,11 @@ class CustomValue < ActiveRecord::Base
     end
   end
   
+  # Returns true if the boolean custom value is true
+  def true?
+    self.value == '1'
+  end
+  
 protected
   def validate
     if value.blank?