diff --git a/htdocs/install/mysql/migration/3.4.0-3.5.0.sql b/htdocs/install/mysql/migration/3.4.0-3.5.0.sql
index e1285d52c1a..17dbf296e70 100755
--- a/htdocs/install/mysql/migration/3.4.0-3.5.0.sql
+++ b/htdocs/install/mysql/migration/3.4.0-3.5.0.sql
@@ -67,3 +67,7 @@ DROP table llx_adherent_options;
 DROP table llx_adherent_options_label;
 
 ALTER TABLE llx_user ADD accountancy_code VARCHAR( 24 ) NULL;
+
+DELETE FROM llx_boxes_def where file='box_activity.php' AND note IS NULL;
+  
+