diff --git a/fan_pwm.cpp b/fan_pwm.cpp
index f814c0a..23eb6dc 100644
--- a/fan_pwm.cpp
+++ b/fan_pwm.cpp
@@ -24,8 +24,8 @@
     // Write target out to sysfs
     try
     {
-        ioAccess->write(value, type, id, empty, hwmonio::retries,
-                        hwmonio::delay);
+        _ioAccess->write(value, _type, _id, empty, hwmonio::retries,
+                         hwmonio::delay);
     }
     catch (const std::system_error& e)
     {
@@ -34,9 +34,10 @@
             xyz::openbmc_project::Control::Device::WriteFailure::CALLOUT_ERRNO(
                 e.code().value()),
             xyz::openbmc_project::Control::Device::WriteFailure::
-                CALLOUT_DEVICE_PATH(devPath.c_str()));
+                CALLOUT_DEVICE_PATH(_devPath.c_str()));
 
-        auto file = sysfs::make_sysfs_path(ioAccess->path(), type, id, empty);
+        auto file =
+            sysfs::make_sysfs_path(_ioAccess->path(), _type, _id, empty);
 
         log<level::INFO>("Logging failing sysfs file",
                          phosphor::logging::entry("FILE=%s", file.c_str()));
diff --git a/fan_pwm.hpp b/fan_pwm.hpp
index e80dde0..7aa2a75 100644
--- a/fan_pwm.hpp
+++ b/fan_pwm.hpp
@@ -33,7 +33,7 @@
            sdbusplus::bus::bus& bus, const char* objPath, bool defer,
            uint64_t target) :
         FanPwmObject(bus, objPath, defer),
-        id(id), ioAccess(std::move(io)), devPath(devPath)
+        _id(id), _ioAccess(std::move(io)), _devPath(devPath)
     {
         FanPwmObject::target(target);
     }
@@ -47,13 +47,13 @@
 
   private:
     /** @brief hwmon type */
-    static constexpr auto type = "pwm";
+    static constexpr auto _type = "pwm";
     /** @brief hwmon id */
-    std::string id;
+    std::string _id;
     /** @brief Hwmon sysfs access. */
-    std::unique_ptr<hwmonio::HwmonIOInterface> ioAccess;
+    std::unique_ptr<hwmonio::HwmonIOInterface> _ioAccess;
     /** @brief Physical device path. */
-    std::string devPath;
+    std::string _devPath;
 };
 
 } // namespace hwmon