diff --git a/superset/aric_detokeniser.py b/superset/aric_detokeniser.py
index f100bf83a..d25ae6b50 100644
--- a/superset/aric_detokeniser.py
+++ b/superset/aric_detokeniser.py
@@ -23,6 +23,7 @@
 from asyncio import events
 
 from requests_futures.sessions import FuturesSession
+import concurrent.futures
 import json
 import logging
 from pandas import DataFrame