diff --git a/source/atom.xml b/source/atom.xml
index 1d9d521..9a87a76 100644
--- a/source/atom.xml
+++ b/source/atom.xml
@@ -2,7 +2,7 @@
 layout: null
 ---
 <?xml version="1.0" encoding="utf-8"?>
-<feed xmlns="https://www.w3.org/2005/Atom">
+<feed xmlns="http://www.w3.org/2005/Atom">
 
   <title><![CDATA[{{ site.title | cdata_escape }}]]></title>
   <link href="{{ site.url }}/atom.xml" rel="self" type="application/atom+xml"/>