diff --git a/lib/libtelnet/Makefile b/lib/libtelnet/Makefile
index 27bd2d5a22e0..220717b5efa0 100644
--- a/lib/libtelnet/Makefile
+++ b/lib/libtelnet/Makefile
@@ -1,29 +1,30 @@
 #	From: @(#)Makefile	8.2 (Berkeley) 12/15/93
 # $FreeBSD$
 
 .include <src.opts.mk>
 
 PACKAGE=lib${LIB}
 TELNETDIR=	${SRCTOP}/contrib/telnet
 .PATH:		${TELNETDIR}/libtelnet
 
 LIB=		telnet
 
 INTERNALLIB=
 
 SRCS=		genget.c getent.c misc.c
 CFLAGS+=	-I${TELNETDIR}
 
 WARNS?=		2
 
 .if ${MK_OPENSSL} != "no"
 SRCS+=		encrypt.c auth.c enc_des.c sra.c pk.c
 CFLAGS+=	-DENCRYPTION -DAUTHENTICATION -DSRA
+CFLAGS+=	-DOPENSSL_API_COMPAT=0x10100000L
 .endif
 
 .if ${MK_KERBEROS_SUPPORT} != "no"
 SRCS+=		kerberos5.c
 CFLAGS+=	-DKRB5 -DFORWARD -Dnet_write=telnet_net_write
 .endif
 
 .include <bsd.lib.mk>