diff --git a/interface.hpp b/interface.hpp
index b3bf73e..911aa14 100644
--- a/interface.hpp
+++ b/interface.hpp
@@ -1,6 +1,8 @@
 #pragma once
 
 #include <xyz/openbmc_project/Sensor/Value/server.hpp>
+#include <xyz/openbmc_project/Sensor/Threshold/Warning/server.hpp>
+#include <xyz/openbmc_project/Sensor/Threshold/Critical/server.hpp>
 #include <sdbusplus/server.hpp>
 
 template <typename T>
@@ -8,10 +10,18 @@
 
 using ValueInterface = sdbusplus::xyz::openbmc_project::Sensor::server::Value;
 using ValueObject = ServerObject<ValueInterface>;
+using WarningInterface =
+    sdbusplus::xyz::openbmc_project::Sensor::Threshold::server::Warning;
+using WarningObject = ServerObject<WarningInterface>;
+using CriticalInterface =
+    sdbusplus::xyz::openbmc_project::Sensor::Threshold::server::Critical;
+using CriticalObject = ServerObject<CriticalInterface>;
 
 enum class InterfaceType
 {
     VALUE,
+    WARN,
+    CRIT,
 };
 
 // vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4