diff --git a/transport/disk.py b/transport/disk.py
index 25ff336..1b9c648 100644
--- a/transport/disk.py
+++ b/transport/disk.py
@@ -7,6 +7,7 @@ else:
 import json
 from threading import Lock
 import sqlite3
+import pandas as pd
 
 class DiskReader(Reader) :
 	"""