diff --git a/invesalius/gui/frame.py b/invesalius/gui/frame.py
index 586a213..63c3bc4 100755
--- a/invesalius/gui/frame.py
+++ b/invesalius/gui/frame.py
@@ -16,6 +16,8 @@
 #    PARTICULAR. Consulte a Licenca Publica Geral GNU para obter mais
 #    detalhes.
 #--------------------------------------------------------------------------
+import sys
+
 import wx
 import wx.aui
 import wx.lib.pubsub as ps
--
libgit2 0.21.2