diff --git a/openerp/service/db.py b/openerp/service/db.py
index c18bb7f6afb..5bea33456c7 100644
--- a/openerp/service/db.py
+++ b/openerp/service/db.py
@@ -333,7 +333,7 @@ def exp_list(document=False):
                 cr.execute("select datname from pg_database where datdba=(select usesysid from pg_user where usename=%s) and datname not in %s order by datname", (db_user, templates_list))
             else:
                 cr.execute("select datname from pg_database where datname not in %s order by datname", (templates_list,))
-            res = [tools.ustr(name) for (name,) in cr.fetchall()]
+            res = [openerp.tools.ustr(name) for (name,) in cr.fetchall()]
         except Exception:
             res = []
     finally: