diff --git a/data/voxforge/voxforge.py b/data/voxforge/voxforge.py
index 63f052bd7..396a29e1b 100644
--- a/data/voxforge/voxforge.py
+++ b/data/voxforge/voxforge.py
@@ -11,6 +11,7 @@ from __future__ import print_function
 
 import os
 import codecs
+import datetime
 import soundfile
 import json
 import argparse