diff --git a/src/calibre/library/database2.py b/src/calibre/library/database2.py
index a3211b3817..8b4ad47284 100644
--- a/src/calibre/library/database2.py
+++ b/src/calibre/library/database2.py
@@ -2012,7 +2012,7 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
                 val = mi.get(key, None)
                 if force_changes or val is not None:
                     doit(self.set_custom, id, val=val, extra=mi.get_extra(key),
-                         label=user_mi[key]['label'], commit=False)
+                         label=user_mi[key]['label'], commit=False, notify=False)
         if commit:
             self.conn.commit()
         if notify: