diff --git a/product/CMFActivity/ActivityTool.py b/product/CMFActivity/ActivityTool.py
index 731ef71de58722acb7abb4c7bedc64879ae30db5..f3241c1eafd2bf8322c8d269058de38c4080429c 100644
--- a/product/CMFActivity/ActivityTool.py
+++ b/product/CMFActivity/ActivityTool.py
@@ -105,7 +105,7 @@ def enableActivityCreationTrace():
 
 def disableActivityCreationTrace():
   global activity_creation_trace
-  activity_creation_trace = false
+  activity_creation_trace = False
 
 # Here go ActivityBuffer instances
 # Structure: