diff --git a/python/mxnet/ndarray/ndarray.py b/python/mxnet/ndarray/ndarray.py
index 4df97e594a01..24be081344aa 100644
--- a/python/mxnet/ndarray/ndarray.py
+++ b/python/mxnet/ndarray/ndarray.py
@@ -72,21 +72,31 @@
     np.int8: 5,
     np.int64: 6,
     np.bool_: 7,
+    np.int16: 8,
+    np.uint16 : 9,
+    np.uint32 : 10,
+    np.uint64 : 11,
     np.dtype([('bfloat16', np.uint16)]): 12,
 }
 
-_DTYPE_MX_TO_NP = {
-    -1: None,
-    0: np.float32,
-    1: np.float64,
-    2: np.float16,
-    3: np.uint8,
-    4: np.int32,
-    5: np.int8,
-    6: np.int64,
-    7: np.bool_,
-    12: np.dtype([('bfloat16', np.uint16)]),
-}
+def _register_platform_dependent_mx_dtype():
+    """Register platform dependent types to the fixed size counterparts."""
+    kind_map = {'i': 'int', 'u': 'uint', 'f': 'float'}
+    for np_type in [
+       np.byte, np.ubyte, np.short, np.ushort, np.intc, np.uintc, np.int_,
+       np.uint, np.longlong, np.ulonglong, np.half, np.float16, np.single,
+       np.double, np.longdouble]:
+        dtype = np.dtype(np_type)
+        kind, size = dtype.kind, dtype.itemsize
+        bits = size * 8
+        fixed_size_dtype = np
+        fixed_dtype = getattr(np, kind_map[kind]+str(bits))
+        if fixed_dtype in _DTYPE_NP_TO_MX:
+            _DTYPE_NP_TO_MX[np_type] = _DTYPE_NP_TO_MX[fixed_dtype]
+_register_platform_dependent_mx_dtype()
+
+
+_DTYPE_MX_TO_NP = {v: k for k, v in _DTYPE_NP_TO_MX.items()}
 
 _STORAGE_TYPE_STR_TO_ID = {
     'undefined': _STORAGE_TYPE_UNDEFINED,
diff --git a/python/mxnet/numpy/multiarray.py b/python/mxnet/numpy/multiarray.py
index 17c549193324..5274408e4403 100644
--- a/python/mxnet/numpy/multiarray.py
+++ b/python/mxnet/numpy/multiarray.py
@@ -185,7 +185,8 @@ def _as_mx_np_array(object, ctx=None):
     if isinstance(object, ndarray):
         return object
     elif isinstance(object, _np.ndarray):
-        return array(object, dtype=object.dtype, ctx=ctx)
+        np_dtype = _np.dtype(object.dtype).type
+        return array(object, dtype=np_dtype, ctx=ctx)
     elif isinstance(object, (integer_types, numeric_types)):
         return object
     elif isinstance(object, (list, tuple)):