diff --git a/libraries/AP_RPM/AP_RPM.h b/libraries/AP_RPM/AP_RPM.h
index 9cf86dde23..4f7fb6babd 100644
--- a/libraries/AP_RPM/AP_RPM.h
+++ b/libraries/AP_RPM/AP_RPM.h
@@ -13,9 +13,7 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-
-#ifndef __RPM_H__
-#define __RPM_H__
+#pragma once
 
 #include <AP_Common/AP_Common.h>
 #include <AP_HAL/AP_HAL.h>
@@ -97,4 +95,3 @@ private:
     void detect_instance(uint8_t instance);
     void update_instance(uint8_t instance);  
 };
-#endif // __RPM_H__
diff --git a/libraries/AP_RPM/RPM_Backend.h b/libraries/AP_RPM/RPM_Backend.h
index 61138e6c03..6cea9fba19 100644
--- a/libraries/AP_RPM/RPM_Backend.h
+++ b/libraries/AP_RPM/RPM_Backend.h
@@ -13,9 +13,7 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-
-#ifndef __AP_RPM_BACKEND_H__
-#define __AP_RPM_BACKEND_H__
+#pragma once
 
 #include <AP_Common/AP_Common.h>
 #include <AP_HAL/AP_HAL.h>
@@ -39,4 +37,3 @@ protected:
     AP_RPM &ap_rpm;
     AP_RPM::RPM_State &state;
 };
-#endif // __AP_RPM_BACKEND_H__
diff --git a/libraries/AP_RPM/RPM_PX4_PWM.h b/libraries/AP_RPM/RPM_PX4_PWM.h
index 9b5350a682..c4c1ea6824 100644
--- a/libraries/AP_RPM/RPM_PX4_PWM.h
+++ b/libraries/AP_RPM/RPM_PX4_PWM.h
@@ -13,9 +13,7 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
- 
-#ifndef AP_RPM_PX4_PWM_H
-#define AP_RPM_PX4_PWM_H
+#pragma once
 
 #include "AP_RPM.h"
 #include "RPM_Backend.h"
@@ -41,5 +39,3 @@ private:
 
     ModeFilterFloat_Size5 signal_quality_filter {3};
 };
-
-#endif // AP_RPM_PX4_PWM_H
diff --git a/libraries/AP_RPM/RPM_SITL.h b/libraries/AP_RPM/RPM_SITL.h
index 2688dfebf8..4a94be62b1 100644
--- a/libraries/AP_RPM/RPM_SITL.h
+++ b/libraries/AP_RPM/RPM_SITL.h
@@ -13,9 +13,7 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
- 
-#ifndef AP_RPM_SITL_H
-#define AP_RPM_SITL_H
+#pragma once
 
 #if CONFIG_HAL_BOARD == HAL_BOARD_SITL
 
@@ -37,4 +35,3 @@ private:
 };
 
 #endif // CONFIG_HAL_BOARD
-#endif // AP_RPM_SITL_H