--- a/atoi_base.h
+++ b/atoi_base.h
@@ -17,6 +17,8 @@
 #ifndef __ATOI_BASE_H_
 #define __ATOI_BASE_H_
 
+#include <stdbool.h>
+
 #ifdef WIN32
 #define	bool	int
 #endif
--- a/parse.h
+++ b/parse.h
@@ -17,6 +17,8 @@
 #ifndef __PARSE_H_
 #define __PARSE_H_
 
+#include <stdbool.h>
+
 bool	GetNextByte(FILE *theFile, unsigned int *address, unsigned char *data);
 void	InitParse();
 
--- a/picsnoop/dos/serial.h
+++ b/picsnoop/dos/serial.h
@@ -2,7 +2,7 @@
 #ifndef __SERIAL_H_
 #define __SERIAL_H_
 
-#define	bool	int
+#include <stdbool.h>
 
 #define	KEYINT		int86(0x16, &regs, &regs)
 #define	KBHEAD		0x41a
@@ -10,15 +10,12 @@
 
 
 #ifndef	FALSE
-#define	FALSE	0
+#define	FALSE	false
 #endif
 #ifndef	TRUE
-#define	TRUE	1
+#define	TRUE	true
 #endif
 
-#define	false	FALSE
-#define	true	TRUE
-
 #define	INUM1		12			// interrupt vector for com1
 #define	INUM2		11			// interrupt vector for com2
 
--- a/picsnoop/serial.h
+++ b/picsnoop/serial.h
@@ -2,6 +2,8 @@
 #ifndef __SERIAL_H_
 #define __SERIAL_H_
 
+#include <stdbool.h>
+
 #ifdef WIN32
 #define	bool	int
 #endif
--- a/record.c
+++ b/record.c
@@ -49,6 +49,7 @@
 //-----------------------------------------------------------------------------
 
 #include <stdio.h>
+#include <stdbool.h>
 
 #ifdef WIN32
 #include	<windows.h>
--- a/serial.h
+++ b/serial.h
@@ -17,6 +17,8 @@
 #ifndef __SERIAL_H_
 #define __SERIAL_H_
 
+#include <stdbool.h>
+
 #ifdef WIN32
 #define	bool	int
 #endif