diff -u b/lib/Drupal/pgn/Tests/XmlEncoderUnitTest.php b/lib/Drupal/pgn/Tests/XmlEncoderUnitTest.php
--- b/lib/Drupal/pgn/Tests/XmlEncoderUnitTest.php
+++ b/lib/Drupal/pgn/Tests/XmlEncoderUnitTest.php
@@ -10025,7 +10025,11 @@
     $encoder = new XmlEncoder();
 
     $decoded = $encoder->decode($this->pgnxml, 'pgnxml');
-    $this->assertEqual($this->normalized, $decoded, 'Decoded PGNXML is equal to expected PGN data.');
+
+    $expected = $this->normalized;
+    unset($expected['@xmlns']);
+
+    $this->assertEqual($expected, $decoded, 'Decoded PGNXML is equal to expected PGN data.');
 
     $encoded = $encoder->encode($this->normalized, 'pgnxml', array('xml_root_node_name' => 'PGNGAMES'));