diff --git a/scripts/pspec.py b/scripts/pspec.py
index 3176fe7..6883265 100644
--- a/scripts/pspec.py
+++ b/scripts/pspec.py
@@ -13,6 +13,7 @@ import pymses.utils.misc
 import tables as T
 from numpy.fft import fftn, ifft
 from pymses.analysis import Camera, ScalarOperator, cube3d
+import os
 
 __generator__ = "pspec.py"
 __version__ = "0.2"