diff --git a/basic.h b/basic.h
index 6d8a8ad..83f73db 100644
--- a/basic.h
+++ b/basic.h
@@ -22,22 +22,11 @@
  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#include <stdbool.h>
+
 #ifndef BASIC_H
 #define BASIC_H
 
-/* bool definitions */
-#ifndef bool
-#define bool int
-#endif
-
-#ifndef true
-#define true 1
-#endif
-
-#ifndef false
-#define false 0
-#endif
-
 #define BOOL_CAST(x) ((x) ? (true) : (false))
 
 /* size of an array */