diff --git a/lib/damask/__init__.py b/lib/damask/__init__.py
index 8506533fe..9c57ed62f 100644
--- a/lib/damask/__init__.py
+++ b/lib/damask/__init__.py
@@ -1,5 +1,5 @@
 # $Id$
-import sys
+import sys, os
 
 from .environment import Environment      # only one class
 from .asciitable  import ASCIItable       # only one class