diff --git a/Framework/API/inc/MantidAPI/IndexProperty.h b/Framework/API/inc/MantidAPI/IndexProperty.h
index cbdf4f14b10f..aecabf4cc13b 100644
--- a/Framework/API/inc/MantidAPI/IndexProperty.h
+++ b/Framework/API/inc/MantidAPI/IndexProperty.h
@@ -27,7 +27,7 @@ namespace API {
   @author Lamar Moore
   @date 1/7/2017
 */
-class MANTID_API_DLL IndexProperty : public Kernel::ArrayProperty<int64_t> {
+class MANTID_API_DLL IndexProperty : public Kernel::ArrayProperty<int> {
 public:
   IndexProperty(const std::string &name, const IWorkspaceProperty &workspaceProp,
                 const IndexTypeProperty &indexTypeProp,
@@ -39,8 +39,8 @@ class MANTID_API_DLL IndexProperty : public Kernel::ArrayProperty<int64_t> {
 
   IndexProperty *clone() const override;
 
-  using Kernel::ArrayProperty<int64_t>::operator=;
-  using Kernel::ArrayProperty<int64_t>::operator const std::vector<int64_t> &;
+  using Kernel::ArrayProperty<int>::operator=;
+  using Kernel::ArrayProperty<int>::operator const std::vector<int> &;
 
   bool isDefault() const override;
   std::string isValid() const override;
diff --git a/Framework/PythonInterface/mantid/kernel/src/Exports/ArrayLengthValidator.cpp b/Framework/PythonInterface/mantid/kernel/src/Exports/ArrayLengthValidator.cpp
index 558cc16722d7..5bf29f6f4c0d 100644
--- a/Framework/PythonInterface/mantid/kernel/src/Exports/ArrayLengthValidator.cpp
+++ b/Framework/PythonInterface/mantid/kernel/src/Exports/ArrayLengthValidator.cpp
@@ -49,6 +49,6 @@ namespace {
 
 void export_ArrayLengthValidator() {
   EXPORT_LENGTHVALIDATOR(double, Float);
-  EXPORT_LENGTHVALIDATOR(long, Int);
+  EXPORT_LENGTHVALIDATOR(int, Int);
   EXPORT_LENGTHVALIDATOR(std::string, String);
 }
diff --git a/Framework/PythonInterface/mantid/kernel/src/Exports/ArrayOrderedPairsValidator.cpp b/Framework/PythonInterface/mantid/kernel/src/Exports/ArrayOrderedPairsValidator.cpp
index 6110b5abc843..eb7e096bc63c 100644
--- a/Framework/PythonInterface/mantid/kernel/src/Exports/ArrayOrderedPairsValidator.cpp
+++ b/Framework/PythonInterface/mantid/kernel/src/Exports/ArrayOrderedPairsValidator.cpp
@@ -25,5 +25,5 @@ template <typename TYPE> ArrayOrderedPairsValidator<TYPE> *createArrayOrderedPai
 } // namespace
 void export_ArrayOrderedPairsValidator() {
   EXPORT_PAIRSVALIDATOR(double, Float);
-  EXPORT_PAIRSVALIDATOR(long, Int);
+  EXPORT_PAIRSVALIDATOR(int, Int);
 }