diff --git a/src/plugins/qmldesigner/components/navigator/navigatortreemodel.cpp b/src/plugins/qmldesigner/components/navigator/navigatortreemodel.cpp
index 66b6f640faf..a7a163ab18b 100644
--- a/src/plugins/qmldesigner/components/navigator/navigatortreemodel.cpp
+++ b/src/plugins/qmldesigner/components/navigator/navigatortreemodel.cpp
@@ -797,10 +797,7 @@ void NavigatorTreeModel::handleMaterialDrop(const QMimeData *mimeData, int rowNu
     if (!targetNode.metaInfo().isQtQuick3DModel())
         return;
 
-    QByteArray data = mimeData->data(Constants::MIME_TYPE_MATERIAL);
-    QDataStream stream(data);
-    qint32 internalId;
-    stream >> internalId;
+    qint32 internalId = mimeData->data(Constants::MIME_TYPE_MATERIAL).toInt();
     ModelNode matNode = m_view->modelNodeForInternalId(internalId);
 
     m_view->executeInTransaction(__FUNCTION__, [&] {
diff --git a/src/plugins/qmldesigner/components/navigator/navigatorview.cpp b/src/plugins/qmldesigner/components/navigator/navigatorview.cpp
index 2175f786691..31106a87356 100644
--- a/src/plugins/qmldesigner/components/navigator/navigatorview.cpp
+++ b/src/plugins/qmldesigner/components/navigator/navigatorview.cpp
@@ -253,10 +253,7 @@ void NavigatorView::dragStarted(QMimeData *mimeData)
         m_widget->setDragType(itemLibraryEntry.typeName());
         m_widget->update();
     } else if (mimeData->hasFormat(Constants::MIME_TYPE_MATERIAL)) {
-        QByteArray data = mimeData->data(Constants::MIME_TYPE_MATERIAL);
-        QDataStream stream(data);
-        qint32 internalId;
-        stream >> internalId;
+        qint32 internalId = mimeData->data(Constants::MIME_TYPE_MATERIAL).toInt();
         ModelNode matNode = modelNodeForInternalId(internalId);
 
         m_widget->setDragType(matNode.metaInfo().typeName());