diff --git a/bin/import_voxforge.py b/bin/import_voxforge.py
index 16195a8e..cae5f744 100755
--- a/bin/import_voxforge.py
+++ b/bin/import_voxforge.py
@@ -2,6 +2,7 @@
 import codecs
 import os
 import re
+import sys
 import tarfile
 import threading
 import unicodedata