diff --git a/fan_speed.cpp b/fan_speed.cpp
index db683a2..65e5655 100644
--- a/fan_speed.cpp
+++ b/fan_speed.cpp
@@ -23,8 +23,8 @@
         // Write target out to sysfs
         try
         {
-            ioAccess->write(value, type, id, entry::target, hwmonio::retries,
-                            hwmonio::delay);
+            _ioAccess->write(value, _type, _id, entry::target, hwmonio::retries,
+                             hwmonio::delay);
         }
         catch (const std::system_error& e)
         {
@@ -34,9 +34,9 @@
                 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,
+            auto file = sysfs::make_sysfs_path(_ioAccess->path(), _type, _id,
                                                entry::target);
 
             log<level::INFO>("Logging failing sysfs file",
@@ -51,15 +51,15 @@
 
 void FanSpeed::enable()
 {
-    auto enable = env::getEnv("ENABLE", type, id);
+    auto enable = env::getEnv("ENABLE", _type, _id);
     if (!enable.empty())
     {
         auto val = std::stoul(enable);
 
         try
         {
-            ioAccess->write(val, type::pwm, id, entry::enable, hwmonio::retries,
-                            hwmonio::delay);
+            _ioAccess->write(val, type::pwm, _id, entry::enable,
+                             hwmonio::retries, hwmonio::delay);
         }
         catch (const std::system_error& e)
         {
@@ -69,10 +69,10 @@
                 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 fullPath = sysfs::make_sysfs_path(ioAccess->path(), type::pwm,
-                                                   id, entry::enable);
+            auto fullPath = sysfs::make_sysfs_path(_ioAccess->path(), type::pwm,
+                                                   _id, entry::enable);
 
             log<level::INFO>(
                 "Logging failing sysfs file",
diff --git a/fan_speed.hpp b/fan_speed.hpp
index 96d408e..4b79b2a 100644
--- a/fan_speed.hpp
+++ b/fan_speed.hpp
@@ -34,7 +34,7 @@
              sdbusplus::bus::bus& bus, const char* objPath, bool defer,
              uint64_t target) :
         FanSpeedObject(bus, objPath, defer),
-        id(id), ioAccess(std::move(io)), devPath(devPath)
+        _id(id), _ioAccess(std::move(io)), _devPath(devPath)
     {
         FanSpeedObject::target(target);
     }
@@ -54,13 +54,13 @@
 
   private:
     /** @brief hwmon type */
-    static constexpr auto type = "fan";
+    static constexpr auto _type = "fan";
     /** @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