diff --git a/source/pwrapper/numpyWrap.cpp b/source/pwrapper/numpyWrap.cpp
index 9bec5103e..326be82b6 100644
--- a/source/pwrapper/numpyWrap.cpp
+++ b/source/pwrapper/numpyWrap.cpp
@@ -65,11 +65,11 @@ PyArrayContainer::ExtractData(void *_pParentPyArray)
 	PyArrayObject *pParent = reinterpret_cast<PyArrayObject *>(pParentPyArray);
 
 	int numDims = PyArray_NDIM(pParent);
-	long* pDims = (long*)PyArray_DIMS(pParent);
+	intptr_t* pDims = PyArray_DIMS(pParent);
 
 	pData 		= PyArray_DATA(pParent);
 	TotalSize 	= PyArray_SIZE(pParent);
-	Dims 		= std::vector<long>(&pDims[0], &pDims[numDims]);
+	Dims = std::vector<int>(pDims, pDims + numDims);
 
 	int iDataType = PyArray_TYPE(pParent);
 	switch(iDataType) {
diff --git a/source/pwrapper/numpyWrap.h b/source/pwrapper/numpyWrap.h
index 75907c441..a28cc2791 100644
--- a/source/pwrapper/numpyWrap.h
+++ b/source/pwrapper/numpyWrap.h
@@ -60,7 +60,7 @@ namespace Manta
 			void *pData;
 			NumpyTypes DataType;
 			unsigned int TotalSize;
-			std::vector<long> Dims;
+			std::vector<int> Dims;
 		private:
 			void *pParentPyArray;
 	};