diff --git a/src/Gui/MetaTypes.h b/src/Gui/MetaTypes.h
index 99b69ed431..bac3a6d42a 100644
--- a/src/Gui/MetaTypes.h
+++ b/src/Gui/MetaTypes.h
@@ -28,7 +28,10 @@
 #include <Base/Placement.h>
 #include <Base/Quantity.h>
 #include <App/DocumentObserver.h>
+#include <QMetaType>
+#include <QList>
 
+// NOLINTBEGIN
 Q_DECLARE_METATYPE(Base::Vector3f)
 Q_DECLARE_METATYPE(Base::Vector3d)
 Q_DECLARE_METATYPE(QList<Base::Vector3d>)
@@ -39,5 +42,6 @@ Q_DECLARE_METATYPE(Base::Quantity)
 Q_DECLARE_METATYPE(QList<Base::Quantity>)
 Q_DECLARE_METATYPE(App::SubObjectT)
 Q_DECLARE_METATYPE(QList<App::SubObjectT>)
+// NOLINTEND
 
 #endif // GUI_METATYPES_H
diff --git a/src/Mod/Material/App/MaterialLibrary.cpp b/src/Mod/Material/App/MaterialLibrary.cpp
index 1233752be4..8e7803d2cb 100644
--- a/src/Mod/Material/App/MaterialLibrary.cpp
+++ b/src/Mod/Material/App/MaterialLibrary.cpp
@@ -81,7 +81,9 @@ Material* MaterialLibrary::saveMaterial(Material& material, const QString& path,
 
     if (file.open(QIODevice::WriteOnly | QIODevice::Text)) {
         QTextStream stream(&file);
+#if QT_VERSION < QT_VERSION_CHECK(6,0,0)
         stream.setCodec("UTF-8");
+#endif
         stream.setGenerateByteOrderMark(true);
 
         // Write the contents
diff --git a/src/Mod/Material/App/MaterialPyImpl.cpp b/src/Mod/Material/App/MaterialPyImpl.cpp
index 0120b66b00..8248f2951f 100644
--- a/src/Mod/Material/App/MaterialPyImpl.cpp
+++ b/src/Mod/Material/App/MaterialPyImpl.cpp
@@ -346,7 +346,7 @@ static PyObject* _pyObjectFromVariant(const QVariant& value)
         return new PyObject();
     }
 
-    if (value.userType() == QMetaType::type("Base::Quantity")) {
+    if (value.userType() == qMetaTypeId<Base::Quantity>()) {
         return new Base::QuantityPy(new Base::Quantity(value.value<Base::Quantity>()));
     }
     else if (value.userType() == QMetaType::Double) {
diff --git a/src/Mod/Material/App/MaterialValue.h b/src/Mod/Material/App/MaterialValue.h
index a39ff4578b..409c137d30 100644
--- a/src/Mod/Material/App/MaterialValue.h
+++ b/src/Mod/Material/App/MaterialValue.h
@@ -175,7 +175,20 @@ public:
     const QVariant getValue(int row, int column);
 
 protected:
+#if QT_VERSION < QT_VERSION_CHECK(6,0,0)
     std::map<QVariant, std::vector<std::vector<QVariant>*>> _rowMap;
+#else
+    struct variant_comp
+    {
+        bool operator()(const QVariant& var1,
+                        const QVariant& var2) const
+        {
+            return QVariant::compare(var1, var2) == QPartialOrdering::Less;
+        }
+    };
+    std::map<QVariant, std::vector<std::vector<QVariant>*>, variant_comp> _rowMap;
+#endif
+
     bool _defaultSet;
 };