diff --git a/product/CMFActivity/ActivityBuffer.py b/product/CMFActivity/ActivityBuffer.py
index 3aafd9208d695a409e9528bc152b6af30de75347..adba8fa2d507d7f80e4408eb83923cfa523ae871 100644
--- a/product/CMFActivity/ActivityBuffer.py
+++ b/product/CMFActivity/ActivityBuffer.py
@@ -26,7 +26,6 @@
 from Shared.DC.ZRDB.TM import TM
 from zLOG import LOG, ERROR, INFO
 import sys
-import threading
 
 try:
   from transaction import get as get_transaction