diff --git a/package.json b/package.json
index e6bc9c6..46ca263 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "epubjs",
-  "version": "0.3.19",
+  "version": "0.3.20",
   "description": "Parse and Render Epubs",
   "main": "lib/index.js",
   "jsnext:main": "src/index.js",
diff --git a/src/navigation.js b/src/navigation.js
index 9cdb92c..e5c02e6 100644
--- a/src/navigation.js
+++ b/src/navigation.js
@@ -20,7 +20,7 @@ class Navigation {
 	 * @param {document} xml navigation html / xhtml / ncx
 	 */
 	parse(xml) {
-		let isXml = xml.nodeValue;
+		let isXml = xml.nodeType;
 		if (isXml) {
 			let html = qs(xml, "html");
 			let ncx = qs(xml, "ncx");