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diff --git a/circuitpython/extmod/ulab/code/ndarray_properties.h b/circuitpython/extmod/ulab/code/ndarray_properties.h
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+
+/*
+ * This file is part of the micropython-ulab project,
+ *
+ * https://github.com/v923z/micropython-ulab
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Jeff Epler for Adafruit Industries
+ *               2020-2021 Zoltán Vörös
+*/
+
+#ifndef _NDARRAY_PROPERTIES_
+#define _NDARRAY_PROPERTIES_
+
+#include "py/runtime.h"
+#include "py/binary.h"
+#include "py/obj.h"
+#include "py/objarray.h"
+
+#include "ulab.h"
+#include "ndarray.h"
+#include "numpy/ndarray/ndarray_iter.h"
+
+#if CIRCUITPY
+typedef struct _mp_obj_property_t {
+    mp_obj_base_t base;
+    mp_obj_t proxy[3]; // getter, setter, deleter
+} mp_obj_property_t;
+
+#if NDARRAY_HAS_DTYPE
+MP_DEFINE_CONST_FUN_OBJ_1(ndarray_get_dtype_obj, ndarray_dtype);
+STATIC const mp_obj_property_t ndarray_dtype_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&ndarray_get_dtype_obj,
+              mp_const_none,
+              mp_const_none },
+};
+#endif /* NDARRAY_HAS_DTYPE */
+
+#if NDARRAY_HAS_FLATITER
+MP_DEFINE_CONST_FUN_OBJ_1(ndarray_flatiter_make_new_obj, ndarray_flatiter_make_new);
+STATIC const mp_obj_property_t ndarray_flat_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&ndarray_flatiter_make_new_obj,
+              mp_const_none,
+              mp_const_none },
+};
+#endif /* NDARRAY_HAS_FLATITER */
+
+#if NDARRAY_HAS_ITEMSIZE
+MP_DEFINE_CONST_FUN_OBJ_1(ndarray_get_itemsize_obj, ndarray_itemsize);
+STATIC const mp_obj_property_t ndarray_itemsize_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&ndarray_get_itemsize_obj,
+              mp_const_none,
+              mp_const_none },
+};
+#endif /* NDARRAY_HAS_ITEMSIZE */
+
+#if NDARRAY_HAS_SHAPE
+MP_DEFINE_CONST_FUN_OBJ_1(ndarray_get_shape_obj, ndarray_shape);
+STATIC const mp_obj_property_t ndarray_shape_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&ndarray_get_shape_obj,
+              mp_const_none,
+              mp_const_none },
+};
+#endif /* NDARRAY_HAS_SHAPE */
+
+#if NDARRAY_HAS_SIZE
+MP_DEFINE_CONST_FUN_OBJ_1(ndarray_get_size_obj, ndarray_size);
+STATIC const mp_obj_property_t ndarray_size_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&ndarray_get_size_obj,
+              mp_const_none,
+              mp_const_none },
+};
+#endif /* NDARRAY_HAS_SIZE */
+
+#if NDARRAY_HAS_STRIDES
+MP_DEFINE_CONST_FUN_OBJ_1(ndarray_get_strides_obj, ndarray_strides);
+STATIC const mp_obj_property_t ndarray_strides_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&ndarray_get_strides_obj,
+              mp_const_none,
+              mp_const_none },
+};
+#endif /* NDARRAY_HAS_STRIDES */
+
+#else
+
+void ndarray_properties_attr(mp_obj_t , qstr , mp_obj_t *);
+
+MP_DEFINE_CONST_FUN_OBJ_1(ndarray_dtype_obj, ndarray_dtype);
+MP_DEFINE_CONST_FUN_OBJ_1(ndarray_flatiter_make_new_obj, ndarray_flatiter_make_new);
+MP_DEFINE_CONST_FUN_OBJ_1(ndarray_itemsize_obj, ndarray_itemsize);
+MP_DEFINE_CONST_FUN_OBJ_1(ndarray_shape_obj, ndarray_shape);
+MP_DEFINE_CONST_FUN_OBJ_1(ndarray_size_obj, ndarray_size);
+MP_DEFINE_CONST_FUN_OBJ_1(ndarray_strides_obj, ndarray_strides);
+
+#endif /* CIRCUITPY */
+
+#endif