diff --git a/js/questionset.js b/js/questionset.js
index 764ba43..388678c 100644
--- a/js/questionset.js
+++ b/js/questionset.js
@@ -155,8 +155,8 @@ H5P.QuestionSet = function (options, contentId) {
 
     // Trigger resize on question in case the size of the QS has changed.
     var instance = questionInstances[questionNumber];
-    if (instance.resize !== undefined) {
-      instance.resize();
+    if (instance.$ !== undefined) {
+      instance.$.trigger('resize');
     }
 
     // Update progress indicator