diff --git a/lib/redmine/wiki_formatting/macros.rb b/lib/redmine/wiki_formatting/macros.rb
index e55d5de32..731c1bc00 100644
--- a/lib/redmine/wiki_formatting/macros.rb
+++ b/lib/redmine/wiki_formatting/macros.rb
@@ -221,7 +221,7 @@ module Redmine
         out = ''.html_safe
         out << link_to_function(show_label, js, :id => "#{html_id}-show", :class => 'collapsible collapsed')
         out << link_to_function(hide_label, js, :id => "#{html_id}-hide", :class => 'collapsible', :style => 'display:none;')
-        out << content_tag('div', textilizable(text, :object => obj), :id => html_id, :class => 'collapsed-text', :style => 'display:none;')
+        out << content_tag('div', textilizable(text, :object => obj, :headings => false), :id => html_id, :class => 'collapsed-text', :style => 'display:none;')
         out
       end
 
diff --git a/test/unit/lib/redmine/wiki_formatting/macros_test.rb b/test/unit/lib/redmine/wiki_formatting/macros_test.rb
index 772fa9555..da0094c0b 100644
--- a/test/unit/lib/redmine/wiki_formatting/macros_test.rb
+++ b/test/unit/lib/redmine/wiki_formatting/macros_test.rb
@@ -235,6 +235,22 @@ class Redmine::WikiFormatting::MacrosTest < ActionView::TestCase
     assert_select_in result, 'a.collapsible', :text => 'Hide example'
   end
 
+  def test_macro_collapse_should_not_break_toc
+    text =  <<-RAW
+{{toc}}
+
+h1. Title
+
+{{collapse(Show example, Hide example)
+h2. Heading 
+}}"
+RAW
+
+    expected_toc = '<ul class="toc"><li><a href="#Title">Title</a><ul><li><a href="#Heading">Heading</a></li></ul></li></ul>'
+
+    assert_include expected_toc, textilizable(text).gsub(/[\r\n]/, '')
+  end
+
   def test_macro_child_pages
     expected =  "<p><ul class=\"pages-hierarchy\">\n" +
                  "<li><a href=\"/projects/ecookbook/wiki/Child_1\">Child 1</a>\n" +