diff --git a/examples/UnitUnified/Ameter/Ameter.cpp b/examples/UnitUnified/Ameter/Ameter.cpp
index c542b4e..99ed440 100644
--- a/examples/UnitUnified/Ameter/Ameter.cpp
+++ b/examples/UnitUnified/Ameter/Ameter.cpp
@@ -11,10 +11,11 @@
 
 #include <M5Unified.h>
 #include <M5UnitUnified.h>
-#include <unit/unit_Ameter.hpp>
+#include <M5UnitUnifiedMETER.h>
 #if !defined(USING_M5HAL)
 #include <Wire.h>
 #endif
+#include <cmath>
 
 using namespace m5::unit::ads111x;
 
diff --git a/examples/UnitUnified/Vmeter/Vmeter.cpp b/examples/UnitUnified/Vmeter/Vmeter.cpp
index b7a91e2..5dfdbd5 100644
--- a/examples/UnitUnified/Vmeter/Vmeter.cpp
+++ b/examples/UnitUnified/Vmeter/Vmeter.cpp
@@ -11,7 +11,7 @@
 
 #include <M5Unified.h>
 #include <M5UnitUnified.h>
-#include <unit/unit_Vmeter.hpp>
+#include <M5UnitUnifiedMETER.h>
 #if !defined(USING_M5HAL)
 #include <Wire.h>
 #endif
diff --git a/src/M5UnitMETER.h b/src/M5UnitUnifiedMETER.h
similarity index 64%
rename from src/M5UnitMETER.h
rename to src/M5UnitUnifiedMETER.h
index 0024cc9..9b2eedf 100644
--- a/src/M5UnitMETER.h
+++ b/src/M5UnitUnifiedMETER.h
@@ -4,12 +4,12 @@
  * SPDX-License-Identifier: MIT
  */
 /*!
-  @file M5UnitMETER.h
+  @file M5UnitUnifiedMETER.h
  */
-#ifndef M5_UNIT_METER_H
-#define M5_UNIT_METER_H
+#ifndef M5_UNIT_UNIFIED_METER_H
+#define M5_UNIT_UNIFIED_METER_H
 #ifdef __cplusplus
-#include "M5UnitMETER.hpp"
+#include "M5UnitUnifiedMETER.hpp"
 #else
 #error M5UnitMETER requires a C++ compiler, please change file extension to .cc or .cpp
 #endif
diff --git a/src/M5UnitMETER.hpp b/src/M5UnitUnifiedMETER.hpp
similarity index 82%
rename from src/M5UnitMETER.hpp
rename to src/M5UnitUnifiedMETER.hpp
index 8d32b37..5061f80 100644
--- a/src/M5UnitMETER.hpp
+++ b/src/M5UnitUnifiedMETER.hpp
@@ -4,14 +4,14 @@
  * SPDX-License-Identifier: MIT
  */
 /*!
-  @file M5UnitMETER.hpp
+  @file M5UnitUnifiedMETER.hpp
   @brief Main header of M5UnitMETER
 
   @mainpage M5UnitMETER
   Library for UnitMETER using M5UnitUnified.
 */
-#ifndef M5_UNIT_METER_HPP
-#define M5_UNIT_METER_HPP
+#ifndef M5_UNIT_UNIFIED_METER_HPP
+#define M5_UNIT_UNIFIED_METER_HPP
 
 #include "unit/unit_Ameter.hpp"
 #include "unit/unit_Vmeter.hpp"