diff --git a/include/ircd/m/user/devices.h b/include/ircd/m/user/devices.h
index c01fd3c44..ff395c861 100644
--- a/include/ircd/m/user/devices.h
+++ b/include/ircd/m/user/devices.h
@@ -16,7 +16,7 @@ struct ircd::m::user::devices
 	struct send;
 
 	using closure = std::function<void (const event::idx &, const string_view &)>;
-	using closure_bool = std::function<bool (const event::idx &, const string_view &)>;
+	using closure_bool = util::function_bool<const event::idx &, const string_view &>;
 
 	m::user user;