diff --git a/invesalius/data/viewer_slice.py b/invesalius/data/viewer_slice.py
index e1e6345..9904c32 100755
--- a/invesalius/data/viewer_slice.py
+++ b/invesalius/data/viewer_slice.py
@@ -18,6 +18,7 @@
 #--------------------------------------------------------------------------
 
 import itertools
+import os.path
 
 import vtk
 from vtk.wx.wxVTKRenderWindowInteractor import wxVTKRenderWindowInteractor
--
libgit2 0.21.2