diff --git a/Framework/CurveFitting/inc/MantidCurveFitting/Functions/UserFunction.h b/Framework/CurveFitting/inc/MantidCurveFitting/Functions/UserFunction.h
index df17b444b72a8c8b3a8d60eb359f37b834b8024f..e4438d0374c080b0286385abf71eaf7d6d68fa2f 100644
--- a/Framework/CurveFitting/inc/MantidCurveFitting/Functions/UserFunction.h
+++ b/Framework/CurveFitting/inc/MantidCurveFitting/Functions/UserFunction.h
@@ -8,12 +8,6 @@
 #include "MantidAPI/IFunction1D.h"
 #include <boost/shared_array.hpp>
 
-namespace Mantid {
-namespace Kernel {
-class MuParserExtd;
-}
-}
-
 namespace mu {
 class Parser;
 }
@@ -90,7 +84,6 @@ private:
   /// The formula
   std::string m_formula;
   /// extended muParser instance
-  // Mantid::Kernel::MuParserExtd *m_parser;
   mu::Parser *m_parser;
   /// Used as 'x' variable in m_parser.
   mutable double m_x;
diff --git a/Framework/CurveFitting/src/Functions/UserFunction.cpp b/Framework/CurveFitting/src/Functions/UserFunction.cpp
index 1062456d6fdb6146dc0a9cc606bc0d4f77a64dc6..179c1ab7317e2eecdebd97be494ab4bebf0ab543 100644
--- a/Framework/CurveFitting/src/Functions/UserFunction.cpp
+++ b/Framework/CurveFitting/src/Functions/UserFunction.cpp
@@ -3,7 +3,6 @@
 //----------------------------------------------------------------------
 #include "MantidCurveFitting/Functions/UserFunction.h"
 #include "MantidAPI/FunctionFactory.h"
-//#include "MantidKernel/Math/MuParserExtd.h"
 #include "MantidAPI/MuParserUtils.h"
 #include <boost/tokenizer.hpp>
 #include "MantidGeometry/muParser_Silent.h"
@@ -26,7 +25,6 @@ UserFunction::UserFunction()
     : m_parser(new mu::Parser()), m_x(0.), m_x_set(false) {
   extraOneVarFunctions(*m_parser);
 }
-//    : m_parser(new Mantid::Kernel::MuParserExtd()), m_x(0.), m_x_set(false) {}
 
 /// Destructor
 UserFunction::~UserFunction() { delete m_parser; }
@@ -68,7 +66,6 @@ void UserFunction::setAttribute(const std::string &attName,
   clearAllParameters();
 
   try {
-    // Mantid::Kernel::MuParserExtd tmp_parser;
     mu::Parser tmp_parser;
     extraOneVarFunctions(tmp_parser);
     tmp_parser.SetVarFactory(AddVariable, this);