diff --git a/usr.sbin/pstat/pstat.c b/usr.sbin/pstat/pstat.c
index 6f4e8864ed7..c20469c6d54 100644
--- a/usr.sbin/pstat/pstat.c
+++ b/usr.sbin/pstat/pstat.c
@@ -63,6 +63,7 @@ static char sccsid[] = "@(#)pstat.c	8.9 (Berkeley) 2/16/94";
 #include <sys/conf.h>
 #include <sys/rlist.h>
 
+#include <sys/user.h>
 #include <sys/sysctl.h>
 
 #include <err.h>