diff --git a/app/models/doc_topic.rb b/app/models/doc_topic.rb
index c6c887b..a5d9727 100644
--- a/app/models/doc_topic.rb
+++ b/app/models/doc_topic.rb
@@ -22,8 +22,11 @@ class DocTopic < DocItem
   end
 
   def self.order(line)
-    line =~ /<h1 class="order-(.*)">.*<\/h1>/
-    $1
+    if line =~ /<h1 class="order-(.*)">.*<\/h1>/
+      $1.to_i
+    else
+      0
+    end
   end
 
 end
diff --git a/test/unit/doc_topic_test.rb b/test/unit/doc_topic_test.rb
index 47d9fb2..f48a2fb 100644
--- a/test/unit/doc_topic_test.rb
+++ b/test/unit/doc_topic_test.rb
@@ -1,4 +1,4 @@
-require 'test_helper'
+require File.dirname(__FILE__) + '/../test_helper'
 
 class DocTopicTest < ActiveSupport::TestCase
   should 'be a DocItem' do
@@ -25,4 +25,12 @@ class DocTopicTest < ActiveSupport::TestCase
     end
   end
 
+  should 'read order from HTML' do
+    assert_equal 1, DocTopic.order('<h1 class="order-1">Some topic</h1>')
+  end
+
+  should 'use 0 as order by default' do
+    assert_equal 0, DocTopic.order('<h1>Some topic</h1>')
+  end
+
 end
--
libgit2 0.21.2