diff --git a/src/gui/dbman.py b/src/gui/dbman.py
index 4cb80ea6c..35d24e2fc 100644
--- a/src/gui/dbman.py
+++ b/src/gui/dbman.py
@@ -112,7 +112,7 @@ class DbManager(CLIDbManager):
     create, rename, delete and open databases.
     """
     ICON_MAP = {
-                CLIDbManager.ICON_NONE : '',
+                CLIDbManager.ICON_NONE : None,
                 CLIDbManager.ICON_RECOVERY : Gtk.STOCK_DIALOG_ERROR,
                 CLIDbManager.ICON_LOCK : 'gramps-lock',
                 CLIDbManager.ICON_OPEN : Gtk.STOCK_OPEN,