diff --git a/prepare.py b/prepare.py
index 262ec10..d219c6a 100755
--- a/prepare.py
+++ b/prepare.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 from __future__ import print_function
-from numpy import *
+import numpy as np
 import itertools
 from os import path, makedirs, getcwd, chdir
 from subprocess import call, check_output