diff --git a/python/mxnet/optimizer.py b/python/mxnet/optimizer.py
index f758af5f982c..7e69cf6131f6 100644
--- a/python/mxnet/optimizer.py
+++ b/python/mxnet/optimizer.py
@@ -24,7 +24,7 @@
 import warnings
 import numpy
 from .base import py_str
-from .ndarray import (NDArray, zeros, clip, sqrt, cast, maximum, abs as NDabs)
+from .ndarray import (NDArray, zeros, clip, sqrt, cast, maximum, abs as NDabs, array, multiply)
 from .ndarray import (sgd_update, sgd_mom_update, adam_update, rmsprop_update, rmspropalex_update,
                       mp_sgd_update, mp_sgd_mom_update, square, ftrl_update, ftml_update,
                       signsgd_update, signum_update)