diff --git a/chart2/source/controller/main/UndoActions.cxx b/chart2/source/controller/main/UndoActions.cxx
index 6e9ba0d80b22..48f156b4f730 100644
--- a/chart2/source/controller/main/UndoActions.cxx
+++ b/chart2/source/controller/main/UndoActions.cxx
@@ -35,9 +35,7 @@ namespace chart::impl
     using ::com::sun::star::lang::DisposedException;
 
 UndoElement::UndoElement( const OUString& i_actionString, const Reference< XModel >& i_documentModel, const std::shared_ptr< ChartModelClone >& i_modelClone )
-    :UndoElement_MBase()
-    ,UndoElement_TBase( m_aMutex )
-    ,m_sActionString( i_actionString )
+    :m_sActionString( i_actionString )
     ,m_xDocumentModel( i_documentModel )
     ,m_pModelClone( i_modelClone )
 {
@@ -47,7 +45,7 @@ UndoElement::~UndoElement()
 {
 }
 
-void SAL_CALL UndoElement::disposing()
+void UndoElement::disposing(std::unique_lock<std::mutex>&)
 {
     if ( m_pModelClone )
         m_pModelClone->dispose();
diff --git a/chart2/source/controller/main/UndoActions.hxx b/chart2/source/controller/main/UndoActions.hxx
index 0f50d88037c8..8c92440cd60e 100644
--- a/chart2/source/controller/main/UndoActions.hxx
+++ b/chart2/source/controller/main/UndoActions.hxx
@@ -22,8 +22,6 @@
 
 #include <rtl/ustring.hxx>
 #include <comphelper/compbase.hxx>
-#include <cppuhelper/compbase.hxx>
-#include <cppuhelper/basemutex.hxx>
 
 #include <memory>
 
@@ -38,11 +36,9 @@ class ChartModelClone;
 namespace impl
 {
 
-typedef ::cppu::BaseMutex                                                           UndoElement_MBase;
-typedef ::cppu::WeakComponentImplHelper< css::document::XUndoAction > UndoElement_TBase;
+typedef comphelper::WeakComponentImplHelper< css::document::XUndoAction > UndoElement_TBase;
 
-class UndoElement   :public UndoElement_MBase
-                    ,public UndoElement_TBase
+class UndoElement final : public UndoElement_TBase
 {
 public:
     /** creates a new undo action
@@ -59,6 +55,7 @@ public:
                  const css::uno::Reference< css::frame::XModel >& i_documentModel,
                  const std::shared_ptr< ChartModelClone >& i_modelClone
                );
+    virtual ~UndoElement() override;
 
     UndoElement(const UndoElement&) = delete;
     const UndoElement& operator=(const UndoElement&) = delete;
@@ -68,11 +65,8 @@ public:
     virtual void SAL_CALL undo(  ) override;
     virtual void SAL_CALL redo(  ) override;
 
-    // OComponentHelper
-    virtual void SAL_CALL disposing() override;
-
-protected:
-    virtual ~UndoElement() override;
+    // WeakComponentImplHelper
+    virtual void disposing(std::unique_lock<std::mutex>&) override;
 
 private:
     void    impl_toggleModelState();