diff --git a/mainloop.cpp b/mainloop.cpp
index 746e032..8c21566 100644
--- a/mainloop.cpp
+++ b/mainloop.cpp
@@ -36,7 +36,8 @@
       _shutdown(false),
       _path(path),
       _prefix(prefix),
-      _root(root)
+      _root(root),
+      state()
 {
     if (_path.back() == '/')
     {
diff --git a/mainloop.hpp b/mainloop.hpp
index 23ee683..d1fc9ca 100644
--- a/mainloop.hpp
+++ b/mainloop.hpp
@@ -2,6 +2,7 @@
 
 #include <string>
 #include <sdbusplus/server.hpp>
+#include "sensorset.hpp"
 
 /** @class MainLoop
  *  @brief hwmon-readd main application loop.
@@ -45,6 +46,9 @@
         void shutdown() noexcept;
 
     private:
+        using mapped_type = std::tuple<SensorSet::mapped_type>;
+        using SensorState = std::map<SensorSet::key_type, mapped_type>;
+
         /** @brief sdbusplus bus client connection. */
         sdbusplus::bus::bus _bus;
         /** @brief sdbusplus freedesktop.ObjectManager storage. */
@@ -57,4 +61,6 @@
         const char* _prefix;
         /** @brief DBus sensors namespace root. */
         const char* _root;
+        /** @brief DBus object state. */
+        SensorState state;
 };