diff --git a/src/log.h b/src/log.h
index 41b5103..947cfbf 100644
--- a/src/log.h
+++ b/src/log.h
@@ -19,12 +19,9 @@
  * 02110-1301, USA.
  */
 
-#ifndef LOG_H
-#define LOG_H
+#pragma once
 
 void log_open(const char *filename);
 void log_write(char c);
 void log_close(void);
 void log_exit(void);
-
-#endif
diff --git a/src/options.h b/src/options.h
index c28ba6b..57ea7c8 100644
--- a/src/options.h
+++ b/src/options.h
@@ -19,8 +19,7 @@
  * 02110-1301, USA.
  */
 
-#ifndef OPTIONS_H
-#define OPTIONS_H
+#pragma once
 
 #include <stdbool.h>
 #include <limits.h>
@@ -49,5 +48,3 @@ struct option_t
 extern struct option_t option;
 
 void parse_options(int argc, char *argv[]);
-
-#endif
diff --git a/src/tty.h b/src/tty.h
index b1fdef7..93160cd 100644
--- a/src/tty.h
+++ b/src/tty.h
@@ -19,8 +19,7 @@
  * 02110-1301, USA.
  */
 
-#ifndef TTY_H
-#define TTY_H
+#pragma once
 
 #define KEY_QUESTION 0x3f
 #define KEY_B 0x62
@@ -49,5 +48,3 @@ void tty_configure(void);
 int tty_connect(void);
 void tty_wait_for_device(void);
 void list_serial_devices(void);
-
-#endif