diff --git a/pid/pidloop.hpp b/pid/pidloop.hpp
index 0b8690b..b7d1b34 100644
--- a/pid/pidloop.hpp
+++ b/pid/pidloop.hpp
@@ -17,7 +17,8 @@
  * @param[in] first - boolean to denote if initialization needs to be run.
  * @param[in] ms100cnt - loop timer counter.
  */
-void pidControlLoop(ZoneInterface* zone, boost::asio::steady_timer& timer,
+void pidControlLoop(std::shared_ptr<ZoneInterface> zone,
+                    std::shared_ptr<boost::asio::steady_timer> timer,
                     bool first = true, int ms100cnt = 0);
 
 } // namespace pid_control