diff --git a/include/CPUSensor.hpp b/include/CPUSensor.hpp
index e667897..c4a47bc 100644
--- a/include/CPUSensor.hpp
+++ b/include/CPUSensor.hpp
@@ -45,7 +45,7 @@
     bool show;
     size_t pollTime;
     bool loggedInterfaceDown = false;
-    uint8_t minMaxReadCounter;
+    uint8_t minMaxReadCounter{0};
     int fd;
     void handleResponse(const boost::system::error_code& err);
     void checkThresholds(void) override;
diff --git a/include/ChassisIntrusionSensor.hpp b/include/ChassisIntrusionSensor.hpp
index 142ced3..3f2b7c8 100644
--- a/include/ChassisIntrusionSensor.hpp
+++ b/include/ChassisIntrusionSensor.hpp
@@ -30,19 +30,19 @@
     std::shared_ptr<sdbusplus::asio::dbus_interface> mIface;
     std::shared_ptr<sdbusplus::asio::connection> mDbusConn;
 
-    IntrusionSensorType mType;
+    IntrusionSensorType mType{IntrusionSensorType::gpio};
 
     // intrusion status. 0: not intruded, 1: intruded
     std::string mValue = "unknown";
     std::string mOldValue = "unknown";
 
     // valid if it is PCH register via i2c
-    int mBusId;
-    int mSlaveAddr;
+    int mBusId{-1};
+    int mSlaveAddr{-1};
     boost::asio::deadline_timer mPollTimer;
 
     // valid if it is via GPIO
-    bool mGpioInverted;
+    bool mGpioInverted{false};
     std::string mPinName = "CHASSIS_INTRUSION";
     gpiod::line mGpioLine;
     boost::asio::posix::stream_descriptor mGpioFd;
diff --git a/include/ExternalSensor.hpp b/include/ExternalSensor.hpp
index 3ca3c8a..30147fd 100644
--- a/include/ExternalSensor.hpp
+++ b/include/ExternalSensor.hpp
@@ -56,7 +56,7 @@
 
     std::chrono::steady_clock::time_point writeLast;
     std::chrono::steady_clock::duration writeTimeout;
-    bool writeAlive;
+    bool writeAlive{false};
     bool writePerishable;
     std::function<void(const std::chrono::steady_clock::time_point& now)>
         writeHook;
diff --git a/include/NVMeSensor.hpp b/include/NVMeSensor.hpp
index a0dce78..5c70855 100644
--- a/include/NVMeSensor.hpp
+++ b/include/NVMeSensor.hpp
@@ -26,7 +26,7 @@
   private:
     const unsigned int scanDelayTicks = 5 * 60;
     sdbusplus::asio::object_server& objServer;
-    unsigned int scanDelay;
+    unsigned int scanDelay{0};
 
     void checkThresholds(void) override;
 };
diff --git a/include/PSUEvent.hpp b/include/PSUEvent.hpp
index 3a39164..e7b5c0b 100644
--- a/include/PSUEvent.hpp
+++ b/include/PSUEvent.hpp
@@ -51,7 +51,7 @@
   private:
     int value = 0;
     int fd;
-    size_t errCount;
+    size_t errCount{0};
     std::string path;
     std::string eventName;
 
diff --git a/include/sensor.hpp b/include/sensor.hpp
index 236c6e7..078fc45 100644
--- a/include/sensor.hpp
+++ b/include/sensor.hpp
@@ -68,7 +68,7 @@
         minValue(min), thresholds(std::move(thresholdData)),
         hysteresisTrigger((max - min) * 0.01),
         hysteresisPublish((max - min) * 0.0001), dbusConnection(conn),
-        readState(readState), errCount(0),
+        readState(readState),
         instrumentation(enableInstrumentation
                             ? std::make_unique<SensorInstrumentation>()
                             : nullptr)
@@ -102,7 +102,7 @@
     double hysteresisPublish;
     std::shared_ptr<sdbusplus::asio::connection> dbusConnection;
     PowerState readState;
-    size_t errCount;
+    size_t errCount{0};
     std::unique_ptr<SensorInstrumentation> instrumentation;
 
     // This member variable provides a hook that can be used to receive