diff --git a/main.h b/main.h
index 61c0b31..29b1215 100644
--- a/main.h
+++ b/main.h
@@ -26,6 +26,7 @@
 #include <stdarg.h>
 #include <stdlib.h>
 #include <tchar.h>
+#include <stdbool.h>
 
 /* Define this to enable DEBUG build */
 /*#define DEBUG */
@@ -64,11 +65,6 @@
 
 #define MSGF_OVPN_WAIT     (MSGF_USER + 1)
 
-/* bool definitions */
-#define bool               int
-#define true               1
-#define false              0
-
 /* GCC function attributes */
 #ifdef _MSC_VER
 #define UNUSED
diff --git a/service.c b/service.c
index 0508e16..40b724f 100644
--- a/service.c
+++ b/service.c
@@ -38,7 +38,7 @@
 
 extern options_t o;
 
-bool
+BOOL
 CheckIServiceStatus(BOOL warn)
 {
     SC_HANDLE schSCManager = NULL;