diff --git a/src/keyer.h b/src/keyer.h
index 510c6b4..bc71240 100644
--- a/src/keyer.h
+++ b/src/keyer.h
@@ -1,5 +1,4 @@
-#ifndef KEYER_H
-#define KEYER_H
+#pragma once
 
 #include "settings.h"
 #include "sidetone.h"
@@ -42,6 +41,4 @@ class Keyer final
     bool m_currentlyKeying{false};
     bool m_currentlyPausing{false};
     bool m_keyNextIambicB{false};
-};
-
-#endif
\ No newline at end of file
+};
\ No newline at end of file
diff --git a/src/settings.h b/src/settings.h
index 763c0f8..ee40631 100644
--- a/src/settings.h
+++ b/src/settings.h
@@ -1,5 +1,4 @@
-#ifndef SETTINGS_H
-#define SETTINGS_H
+#pragma once
 
 #include "pico/flash.h"
 
@@ -18,6 +17,4 @@ struct Settings {
 };
 
 void store_settings(Settings &settings);
-Settings read_settings();
-
-#endif
\ No newline at end of file
+Settings read_settings();
\ No newline at end of file
diff --git a/src/sidetone.h b/src/sidetone.h
index e6960e3..0a2a8b2 100644
--- a/src/sidetone.h
+++ b/src/sidetone.h
@@ -1,5 +1,4 @@
-#ifndef SIDETONE_H
-#define SIDETONE_H
+#pragma once
 
 class Sidetone
 {
@@ -11,6 +10,4 @@ class Sidetone
   private:
     Sidetone(){};
     uint m_gpio{0};
-};
-
-#endif
\ No newline at end of file
+};
\ No newline at end of file