diff --git a/manimlib/mobject/mobject.py b/manimlib/mobject/mobject.py
index 57d30e3a..02e4d2b2 100644
--- a/manimlib/mobject/mobject.py
+++ b/manimlib/mobject/mobject.py
@@ -4,6 +4,7 @@ import itertools as it
 import operator as op
 import os
 import random
+import sys
 
 from colour import Color
 import numpy as np