diff --git a/electric_sieve/ElectricSieve.py b/electric_sieve/ElectricSieve.py
index 49cf1ed..eb66be3 100644
--- a/electric_sieve/ElectricSieve.py
+++ b/electric_sieve/ElectricSieve.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-import sys, random
+import sys, random, subprocess
 from random import randint, randrange, choice
 from time import time
 from operator import itemgetter