diff --git a/Framework/Kernel/inc/MantidKernel/EnumeratedStringProperty.h b/Framework/Kernel/inc/MantidKernel/EnumeratedStringProperty.h
index 072794fbbd68..da56206f9fcc 100644
--- a/Framework/Kernel/inc/MantidKernel/EnumeratedStringProperty.h
+++ b/Framework/Kernel/inc/MantidKernel/EnumeratedStringProperty.h
@@ -6,7 +6,6 @@
 // SPDX - License - Identifier: GPL - 3.0 +
 #pragma once
 #include "MantidKernel/EnumeratedString.h"
-#include "MantidKernel/NullValidator.h"
 #include "MantidKernel/Property.h"
 #include <vector>
 
@@ -59,7 +58,6 @@ template <class E, std::vector<std::string> const *const names> class Enumerated
   std::string isValid() const override;
   bool isDefault() const override;
   std::vector<std::string> allowedValues() const override;
-  bool isMultipleSelectionAllowed() override;
 
   // SETTERS
   std::string setValue(E const value);
diff --git a/Framework/Kernel/inc/MantidKernel/EnumeratedStringProperty.hxx b/Framework/Kernel/inc/MantidKernel/EnumeratedStringProperty.hxx
index 1ea921e6c713..38d01033a3e0 100644
--- a/Framework/Kernel/inc/MantidKernel/EnumeratedStringProperty.hxx
+++ b/Framework/Kernel/inc/MantidKernel/EnumeratedStringProperty.hxx
@@ -6,25 +6,8 @@
 // SPDX - License - Identifier: GPL - 3.0 +
 #pragma once
 
-#include <iomanip>
-#include <iostream>
-#include <sstream>
-#include <type_traits>
-#include <vector>
-#ifndef Q_MOC_RUN
-#include <boost/algorithm/string/trim.hpp>
-#include <memory>
-#endif
-#include "MantidKernel/EnumeratedStringProperty.h"
-#include "MantidKernel/Exception.h"
-#include "MantidKernel/IPropertySettings.h"
-#include "MantidKernel/Logger.h"
-#include "MantidKernel/NullValidator.h"
-#include "MantidKernel/OptionalBool.h"
 #include "MantidKernel/PropertyHelper.h"
 #include "MantidKernel/PropertyWithValueJSON.h"
-#include "MantidKernel/StringTokenizer.h"
-#include "MantidKernel/Strings.h"
 #include <json/value.h>
 
 namespace Mantid::Kernel {
@@ -188,14 +171,6 @@ std::vector<std::string> EnumeratedStringProperty<E, names>::allowedValues() con
   return *names;
 }
 
-/** Returns true, as multiple selection is allowed.
- *  @return true
- */
-template <class E, std::vector<std::string> const *const names>
-bool EnumeratedStringProperty<E, names>::isMultipleSelectionAllowed() {
-  return true;
-}
-
 // ######################################################//
 //     SETTERS
 // ######################################################//