diff --git a/muparser-2.2.5/include/muParserCallback.h b/muparser-2.2.5/include/muParserCallback.h
index e153165af..83417f27b 100644
--- a/muparser-2.2.5/include/muParserCallback.h
+++ b/muparser-2.2.5/include/muParserCallback.h
@@ -46,7 +46,7 @@ namespace mu {
 
     \author (C) 2004-2011 Ingo Berg
 */
-class ParserCallback {
+class ParserCallback final {
    public:
     ParserCallback(fun_type0 a_pFun, bool a_bAllowOpti);
     ParserCallback(fun_type1 a_pFun, bool a_bAllowOpti, int a_iPrec = -1,
@@ -70,8 +70,6 @@ class ParserCallback {
     ParserCallback();
     ParserCallback(const ParserCallback& a_Fun);
 
-    ParserCallback* Clone() const;
-
     bool IsOptimizable() const;
     void* GetAddr() const;
     ECmdCode GetCode() const;
diff --git a/muparser-2.2.5/include/muParserToken.h b/muparser-2.2.5/include/muParserToken.h
index 5f268c529..111e3e7fe 100644
--- a/muparser-2.2.5/include/muParserToken.h
+++ b/muparser-2.2.5/include/muParserToken.h
@@ -116,7 +116,7 @@ class ParserToken {
         m_iType = a_Tok.m_iType;
         m_fVal = a_Tok.m_fVal;
         // create new callback object if a_Tok has one
-        m_pCallback.reset(a_Tok.m_pCallback.get() ? a_Tok.m_pCallback->Clone() : 0);
+        m_pCallback.reset(a_Tok.m_pCallback ? new ParserCallback(*a_Tok.m_pCallback) : nullptr);
     }
 
     //------------------------------------------------------------------------------
diff --git a/muparser-2.2.5/src/muParserCallback.cpp b/muparser-2.2.5/src/muParserCallback.cpp
index fb0d544b3..abb2c594f 100644
--- a/muparser-2.2.5/src/muParserCallback.cpp
+++ b/muparser-2.2.5/src/muParserCallback.cpp
@@ -214,19 +214,7 @@ ParserCallback::ParserCallback()
 //---------------------------------------------------------------------------
 /** \brief Copy constructor.
 */
-ParserCallback::ParserCallback(const ParserCallback& ref) {
-    m_pFun = ref.m_pFun;
-    m_iArgc = ref.m_iArgc;
-    m_bAllowOpti = ref.m_bAllowOpti;
-    m_iCode = ref.m_iCode;
-    m_iType = ref.m_iType;
-    m_iPri = ref.m_iPri;
-    m_eOprtAsct = ref.m_eOprtAsct;
-}
-
-//---------------------------------------------------------------------------
-/** \brief Clone this instance and return a pointer to the new instance. */
-ParserCallback* ParserCallback::Clone() const { return new ParserCallback(*this); }
+ParserCallback::ParserCallback(const ParserCallback& ref) = default;
 
 //---------------------------------------------------------------------------
 /** \brief Return tru if the function is conservative.