diff --git a/sphinx_rtd_theme/breadcrumbs.html b/sphinx_rtd_theme/breadcrumbs.html
index 0028421e..131d497c 100644
--- a/sphinx_rtd_theme/breadcrumbs.html
+++ b/sphinx_rtd_theme/breadcrumbs.html
@@ -1,3 +1,11 @@
+{# Support for Sphinx 1.3+ page_source_suffix, but don't break old builds. #}
+
+{% if page_source_suffix %} 
+{% set suffix = page_source_suffix %}
+{% else %}
+{% set suffix = source_suffix %}
+{% endif %}
+
 <div role="navigation" aria-label="breadcrumbs navigation">
   <ul class="wy-breadcrumbs">
     <li><a href="{{ pathto(master_doc) }}">Docs</a> &raquo;</li>
@@ -8,11 +16,11 @@
       <li class="wy-breadcrumbs-aside">
         {% if pagename != "search" %}
           {% if display_github %}
-            <a href="https://{{ github_host|default("github.com") }}/{{ github_user }}/{{ github_repo }}/blob/{{ github_version }}{{ conf_py_path }}{{ pagename }}{{ source_suffix }}" class="fa fa-github"> Edit on GitHub</a>
+            <a href="https://{{ github_host|default("github.com") }}/{{ github_user }}/{{ github_repo }}/blob/{{ github_version }}{{ conf_py_path }}{{ pagename }}{{ suffix }}" class="fa fa-github"> Edit on GitHub</a>
           {% elif display_bitbucket %}
-            <a href="https://bitbucket.org/{{ bitbucket_user }}/{{ bitbucket_repo }}/src/{{ bitbucket_version}}{{ conf_py_path }}{{ pagename }}{{ source_suffix }}" class="fa fa-bitbucket"> Edit on Bitbucket</a>
+            <a href="https://bitbucket.org/{{ bitbucket_user }}/{{ bitbucket_repo }}/src/{{ bitbucket_version}}{{ conf_py_path }}{{ pagename }}{{ suffix }}" class="fa fa-bitbucket"> Edit on Bitbucket</a>
           {% elif show_source and source_url_prefix %}
-            <a href="{{ source_url_prefix }}{{ pagename }}{{ source_suffix }}">View page source</a>
+            <a href="{{ source_url_prefix }}{{ pagename }}{{ suffix }}">View page source</a>
           {% elif show_source and has_source and sourcename %}
             <a href="{{ pathto('_sources/' + sourcename, true)|e }}" rel="nofollow"> View page source</a>
           {% endif %}