diff --git a/notebook/services/sessions/sessionmanager.py b/notebook/services/sessions/sessionmanager.py
index 4497cfbc33..9730302782 100644
--- a/notebook/services/sessions/sessionmanager.py
+++ b/notebook/services/sessions/sessionmanager.py
@@ -3,7 +3,6 @@
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
 
-import os
 import uuid
 
 try: