diff --git a/presave.js b/presave.js
index 6727b1e..4c629b5 100644
--- a/presave.js
+++ b/presave.js
@@ -10,7 +10,7 @@ var H5PPresave = H5PPresave || {};
 H5PPresave['H5P.QuestionSet'] = function (content, finished) {
   var presave = H5PEditor.Presave;
 
-  if (isContentInValid()) {
+  if (isContentInvalid()) {
     throw new presave.exceptions.InvalidContentSemanticsException('Invalid Question Set Error')
   }
 
@@ -38,7 +38,7 @@ H5PPresave['H5P.QuestionSet'] = function (content, finished) {
    * Check if required parameters is present
    * @return {boolean}
    */
-  function isContentInValid() {
+  function isContentInvalid() {
     return !presave.checkNestedRequirements(content, 'content.questions') || !Array.isArray(content.questions);
   }
 };