diff --git a/hiboo/account/login.py b/hiboo/account/login.py
index 5b0e2c148cd6aeeca173b9d4f313c568c0a15c8a..924a9b788667fa77a692eaf3568bac756ee133fc 100644
--- a/hiboo/account/login.py
+++ b/hiboo/account/login.py
@@ -43,7 +43,7 @@ def signup():
             models.db.session.add(user)
             models.db.session.add(auth)
             models.log(models.History.SIGNUP,
-                comment=_("Signed up using the Web form"), user=user)
+                comment=str(_("Signed up using the Web form")), user=user)
             models.db.session.commit()
             flask.flash(_("User created successfully"), "success")
             return flask.redirect(utils.url_or_intent("account.home"))