diff --git a/formats/AtomFormat.php b/formats/AtomFormat.php
index c1bde25f..80a388df 100644
--- a/formats/AtomFormat.php
+++ b/formats/AtomFormat.php
@@ -130,7 +130,7 @@ EOD;
 		/* Data are prepared, now let's begin the "MAGIE !!!" */
 		$toReturn = <<<EOD
 <?xml version="1.0" encoding="{$charset}"?>
-<feed xmlns="http://www.w3.org/2005/Atom">
+<feed xmlns="http://www.w3.org/2005/Atom" xmlns:media="http://search.yahoo.com/mrss/">
 
 	<title type="text">{$title}</title>
 	<id>{$feedUrl}</id>
diff --git a/tests/samples/expectedAtomFormat/feed.common.xml b/tests/samples/expectedAtomFormat/feed.common.xml
index 80cb0df4..aa6d0687 100644
--- a/tests/samples/expectedAtomFormat/feed.common.xml
+++ b/tests/samples/expectedAtomFormat/feed.common.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<feed xmlns="http://www.w3.org/2005/Atom">
+<feed xmlns="http://www.w3.org/2005/Atom" xmlns:media="http://search.yahoo.com/mrss/">
 
 	<title type="text">Sample feed with common data</title>
 	<id>https://example.com/feed?type=common&amp;items=4</id>
diff --git a/tests/samples/expectedAtomFormat/feed.empty.xml b/tests/samples/expectedAtomFormat/feed.empty.xml
index 371135b6..fc04304d 100644
--- a/tests/samples/expectedAtomFormat/feed.empty.xml
+++ b/tests/samples/expectedAtomFormat/feed.empty.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<feed xmlns="http://www.w3.org/2005/Atom">
+<feed xmlns="http://www.w3.org/2005/Atom" xmlns:media="http://search.yahoo.com/mrss/">
 
 	<title type="text">Sample feed with minimum data</title>
 	<id>https://example.com/feed</id>
diff --git a/tests/samples/expectedAtomFormat/feed.emptyItems.xml b/tests/samples/expectedAtomFormat/feed.emptyItems.xml
index 462a4e5c..989893fa 100644
--- a/tests/samples/expectedAtomFormat/feed.emptyItems.xml
+++ b/tests/samples/expectedAtomFormat/feed.emptyItems.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<feed xmlns="http://www.w3.org/2005/Atom">
+<feed xmlns="http://www.w3.org/2005/Atom" xmlns:media="http://search.yahoo.com/mrss/">
 
 	<title type="text">Sample feed with minimum data</title>
 	<id>https://example.com/feed</id>
diff --git a/tests/samples/expectedAtomFormat/feed.microblog.xml b/tests/samples/expectedAtomFormat/feed.microblog.xml
index a6264aee..32bc0273 100644
--- a/tests/samples/expectedAtomFormat/feed.microblog.xml
+++ b/tests/samples/expectedAtomFormat/feed.microblog.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<feed xmlns="http://www.w3.org/2005/Atom">
+<feed xmlns="http://www.w3.org/2005/Atom" xmlns:media="http://search.yahoo.com/mrss/">
 
 	<title type="text">Sample microblog feed</title>
 	<id>https://example.com/feed</id>