diff --git a/include/ExitAirTempSensor.hpp b/include/ExitAirTempSensor.hpp
index 191f95f..55da203 100644
--- a/include/ExitAirTempSensor.hpp
+++ b/include/ExitAirTempSensor.hpp
@@ -59,9 +59,6 @@
     double alphaF;
     double pOffset = 0;
 
-    // todo: make this private once we don't have to hack in a reading
-    boost::container::flat_map<std::string, double> powerReadings;
-
     ExitAirTempSensor(std::shared_ptr<sdbusplus::asio::connection>& conn,
                       const std::string& name,
                       const std::string& sensorConfiguration,
@@ -78,9 +75,10 @@
 
     std::vector<sdbusplus::bus::match::match> matches;
     double inletTemp = std::numeric_limits<double>::quiet_NaN();
+    boost::container::flat_map<std::string, double> powerReadings;
 
     sdbusplus::asio::object_server& objServer;
-    std::chrono::time_point<std::chrono::system_clock> lastTime;
+    std::chrono::time_point<std::chrono::steady_clock> lastTime;
     double getTotalCFM(void);
     bool calculate(double& val);
 };