diff --git a/sbin/mdmfs/mdmfs.c b/sbin/mdmfs/mdmfs.c
index cd0bf7c96143..c86a098a892d 100644
--- a/sbin/mdmfs/mdmfs.c
+++ b/sbin/mdmfs/mdmfs.c
@@ -49,14 +49,13 @@
 #include <paths.h>
 #include <pwd.h>
 #include <stdarg.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
 #include <unistd.h>
 
-typedef enum { false, true } bool;
-
 struct mtpt_info {
 	uid_t		 mi_uid;
 	bool		 mi_have_uid;