diff --git a/src/dzitilesource.js b/src/dzitilesource.js
index f5b75d69..eb283fab 100644
--- a/src/dzitilesource.js
+++ b/src/dzitilesource.js
@@ -222,6 +222,7 @@ function configureFromXML( tileSource, xmlDoc ){
 
     var root           = xmlDoc.documentElement,
         rootName       = root.localName,
+        ns             = xmlDoc.documentElement.namespaceURI,
         configuration  = null,
         displayRects   = [],
         dispRectNodes,
@@ -233,7 +234,8 @@ function configureFromXML( tileSource, xmlDoc ){
     if ( rootName == "Image" ) {
 
         try {
-            sizeNode = root.getElementsByTagName( "Size" )[ 0 ];
+            sizeNode = root.getElementsByTagNameNS(ns, "Size" )[ 0 ];
+
             configuration = {
                 Image: {
                     xmlns:       "http://schemas.microsoft.com/deepzoom/2008",
@@ -255,10 +257,11 @@ function configureFromXML( tileSource, xmlDoc ){
                 );
             }
 
-            dispRectNodes = root.getElementsByTagName( "DisplayRect" );
+            dispRectNodes = root.getElementsByTagNameNS(ns, "DisplayRect" );
+
             for ( i = 0; i < dispRectNodes.length; i++ ) {
                 dispRectNode = dispRectNodes[ i ];
-                rectNode     = dispRectNode.getElementsByTagName( "Rect" )[ 0 ];
+                rectNode     = dispRectNode.getElementsByTagNameNS(ns, "Rect" )[ 0 ];
 
                 displayRects.push({
                     Rect: {