diff --git a/src/plugins/qmldesigner/components/materialbrowser/materialbrowsermodel.cpp b/src/plugins/qmldesigner/components/materialbrowser/materialbrowsermodel.cpp
index 5a03ba43d8c..2d61b97889f 100644
--- a/src/plugins/qmldesigner/components/materialbrowser/materialbrowsermodel.cpp
+++ b/src/plugins/qmldesigner/components/materialbrowser/materialbrowsermodel.cpp
@@ -363,13 +363,15 @@ void MaterialBrowserModel::copyMaterialProperties(int idx, const QString &sectio
         if (propsSpecObj.contains(section)) { // should always be true
            m_copiedMaterialProps.clear();
            const QJsonArray propNames = propsSpecObj.value(section).toArray();
-           for (const QJsonValueRef &propName : propNames)
+           // auto == QJsonValueConstRef after 04dc959d49e5e3 / Qt 6.4, QJsonValueRef before
+           for (const auto &propName : propNames)
                m_copiedMaterialProps.append(mat.property(propName.toString().toLatin1()));
 
            if (section == "Base") { // add QtQuick3D.Material base props as well
                QJsonObject propsMatObj = m_propertyGroupsObj.value("Material").toObject();
                const QJsonArray propNames = propsMatObj.value("Base").toArray();
-               for (const QJsonValueRef &propName : propNames)
+               // auto == QJsonValueConstRef after 04dc959d49e5e3 / Qt 6.4, QJsonValueRef before
+               for (const auto &propName : propNames)
                    m_copiedMaterialProps.append(mat.property(propName.toString().toLatin1()));
            }
         }