diff --git a/js/questionset.js b/js/questionset.js
index 2a36324..0c8ea6e 100644
--- a/js/questionset.js
+++ b/js/questionset.js
@@ -292,7 +292,7 @@ H5P.QuestionSet = function (options, contentId) {
     if (params.backgroundImage !== undefined) {
       $myDom.css({
         overflow: 'hidden',
-        background: '#000 url(' + H5P.getPath(params.backgroundImage.path, contentId) + ') no-repeat 50% 50%',
+        background: '#000 url("' + H5P.getPath(params.backgroundImage.path, contentId) + '") no-repeat 50% 50%',
         backgroundSize: '100% auto'
       });
     }
diff --git a/library.json b/library.json
index acc1b94..5ccf9a4 100644
--- a/library.json
+++ b/library.json
@@ -3,7 +3,7 @@
   "contentType": "question",
   "majorVersion": 1,
   "minorVersion": 0,
-  "patchVersion": 21,
+  "patchVersion": 22,
   "runnable": 1,
   "machineName": "H5P.QuestionSet",
   "author": "Amendor AS",