diff --git a/epub.js b/epub.js
index c43264a..fb4db00 100644
--- a/epub.js
+++ b/epub.js
@@ -638,7 +638,7 @@ EPub.prototype.getChapter = function (id, callback) {
 EPub.prototype.getChapterRaw = function (id, callback) {
     if (this.manifest[id]) {
 
-        if ((this.manifest[id]['media-type'] || "").toLowerCase().trim()  !=  "application/xhtml+xml") {
+        if (!(this.manifest[id]['media-type'] == "application/xhtml+xml" || this.manifest[id]['media-type'] == "image/svg+xml")) {
             return callback(new Error("Invalid mime type for chapter"));
         }