diff --git a/js/h5p-content-upgrade-process.js b/js/h5p-content-upgrade-process.js
index 8edc28d..1d886cc 100644
--- a/js/h5p-content-upgrade-process.js
+++ b/js/h5p-content-upgrade-process.js
@@ -100,6 +100,7 @@ H5P.ContentUpgradeProcess = (function (Version) {
       else {
         // Go through the minor versions for this major version
         asyncSerial(minors, function (minor, upgrade, nextMinor) {
+          minor =+ minor;
           if (minor <= oldVersion.minor || minor > newVersion.minor) {
             // Older than or equal to the current version or newer than the selected
             nextMinor();
diff --git a/js/h5p-version.js b/js/h5p-version.js
index 605bc04..7089b5a 100644
--- a/js/h5p-version.js
+++ b/js/h5p-version.js
@@ -10,8 +10,8 @@ H5P.Version = (function () {
     var versionSplit = version.split('.', 3);
 
     // Public
-    this.major = versionSplit[0];
-    this.minor = versionSplit[1];
+    this.major =+ versionSplit[0];
+    this.minor =+ versionSplit[1];
 
     /**
      * Public. Custom string for this object.