diff --git a/apps/wizard/installationpage.cpp b/apps/wizard/installationpage.cpp
index 60e9f3ccf9..aec64e275d 100644
--- a/apps/wizard/installationpage.cpp
+++ b/apps/wizard/installationpage.cpp
@@ -18,7 +18,7 @@ Wizard::InstallationPage::InstallationPage(QWidget* parent, Config::GameSettings
     mFinished = false;
 
     mThread = std::make_unique<QThread>();
-    mUnshield = std::make_unique<UnshieldWorker>(mGameSettings.value("morrowind-bsa-filesize").toLongLong());
+    mUnshield = std::make_unique<UnshieldWorker>(mGameSettings.value("morrowind-bsa-filesize").value.toLongLong());
     mUnshield->moveToThread(mThread.get());
 
     connect(mThread.get(), &QThread::started, mUnshield.get(), &UnshieldWorker::extract);