diff --git a/watch-library/shared/watch/watch_gpio.h b/watch-library/shared/watch/watch_gpio.h
index fc43642c..53f1d4dd 100644
--- a/watch-library/shared/watch/watch_gpio.h
+++ b/watch-library/shared/watch/watch_gpio.h
@@ -21,8 +21,9 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#ifndef _WATCH_GPIO_H_INCLUDED
-#define _WATCH_GPIO_H_INCLUDED
+
+#pragma once
+
 ////< @file watch_gpio.h
 
 #include "watch.h"
@@ -73,4 +74,3 @@ void watch_disable_digital_output(const uint8_t pin);
   */
 void watch_set_pin_level(const uint8_t pin, const bool level);
 /// @}
-#endif
diff --git a/watch-library/shared/watch/watch_tcc.h b/watch-library/shared/watch/watch_tcc.h
index 0443b425..401a872e 100644
--- a/watch-library/shared/watch/watch_tcc.h
+++ b/watch-library/shared/watch/watch_tcc.h
@@ -21,8 +21,9 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#ifndef _WATCH_BUZZER_H_INCLUDED
-#define _WATCH_BUZZER_H_INCLUDED
+
+#pragma once
+
 ////< @file watch_buzzer.h
 
 #include "watch.h"
@@ -258,4 +259,3 @@ void watch_set_led_yellow(void);
 void watch_set_led_off(void);
 
 /// @}
-#endif