diff --git a/usr.bin/telnet/telnet.c b/usr.bin/telnet/telnet.c
index 3f735a8bcd69..9569bbdd314e 100644
--- a/usr.bin/telnet/telnet.c
+++ b/usr.bin/telnet/telnet.c
@@ -47,6 +47,7 @@ static char sccsid[] = "@(#)telnet.c	8.2 (Berkeley) 12/15/93";
 
 #include <arpa/telnet.h>
 
+#include <stdlib.h>
 #include <ctype.h>
 
 #include "ring.h"