diff --git a/invesalius/reader/dicom.py b/invesalius/reader/dicom.py
index b4d3d1e..697e998 100644
--- a/invesalius/reader/dicom.py
+++ b/invesalius/reader/dicom.py
@@ -21,6 +21,7 @@ import time
 
 import gdcm
 import vtkgdcm
+import sys
 import wx
 
 
--
libgit2 0.21.2