diff --git a/libraries/AP_ADC/AP_ADC.h b/libraries/AP_ADC/AP_ADC.h
index 37cfbc6be3..6cd95f097b 100644
--- a/libraries/AP_ADC/AP_ADC.h
+++ b/libraries/AP_ADC/AP_ADC.h
@@ -1,5 +1,4 @@
-#ifndef AP_ADC_H
-#define AP_ADC_H
+#pragma once
 
 #include <AP_Common/AP_Common.h>
 /*
@@ -58,5 +57,3 @@ private:
 
 #include "AP_ADC_ADS7844.h"
 #include "AP_ADC_ADS1115.h"
-
-#endif
diff --git a/libraries/AP_ADC/AP_ADC_ADS7844.h b/libraries/AP_ADC/AP_ADC_ADS7844.h
index c4244f05b5..96db42aec8 100644
--- a/libraries/AP_ADC/AP_ADC_ADS7844.h
+++ b/libraries/AP_ADC/AP_ADC_ADS7844.h
@@ -1,7 +1,5 @@
 /// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
-#ifndef __AP_ADC_ADS7844_H__
-#define __AP_ADC_ADS7844_H__
-
+#pragma once
 
 #include <inttypes.h>
 #include "AP_ADC.h"
@@ -30,5 +28,3 @@ private:
     AP_HAL::SPIDeviceDriver *_spi;
     AP_HAL::Semaphore  *_spi_sem;
 };
-
-#endif