diff --git a/configure.ac b/configure.ac
index a22b47bd..c39da0f0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,8 +36,6 @@ LT_INIT
 dnl Checks for libraries.
 
 dnl Checks for header files.
-AC_HEADER_STDBOOL
-
 AC_CHECK_HEADERS(crypt.h errno.h fcntl.h limits.h unistd.h sys/time.h utmp.h \
 	utmpx.h termios.h termio.h sgtty.h sys/ioctl.h syslog.h paths.h \
 	utime.h ulimit.h sys/capability.h sys/random.h sys/resource.h \
diff --git a/lib/defines.h b/lib/defines.h
index 7950cdfa..a47f2571 100644
--- a/lib/defines.h
+++ b/lib/defines.h
@@ -6,21 +6,7 @@
 
 #include "config.h"
 
-#if HAVE_STDBOOL_H
-# include <stdbool.h>
-#else
-# if ! HAVE__BOOL
-#  ifdef __cplusplus
-typedef bool _Bool;
-#  else
-typedef unsigned char _Bool;
-#  endif
-# endif
-# define bool _Bool
-# define false (0)
-# define true  (1)
-# define __bool_true_false_are_defined 1
-#endif
+#include <stdbool.h>
 
 /* Take care of NLS matters.  */
 #ifdef S_SPLINT_S