diff --git a/configure.in b/configure.in
index 45eabbbd..c2c580a1 100644
--- a/configure.in
+++ b/configure.in
@@ -28,6 +28,7 @@ dnl Checks for header files.
 AC_HEADER_DIRENT
 AC_HEADER_STDC
 AC_HEADER_SYS_WAIT
+AC_HEADER_STDBOOL
 
 AC_CHECK_HEADERS(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 \