diff --git a/usr.sbin/tcpdump/tcpdump/Makefile b/usr.sbin/tcpdump/tcpdump/Makefile
index 1133a0a150d5..35f0df0e0f47 100644
--- a/usr.sbin/tcpdump/tcpdump/Makefile
+++ b/usr.sbin/tcpdump/tcpdump/Makefile
@@ -196,6 +196,7 @@ CFLAGS+=-DHAVE_CASPER
 LIBADD+=	crypto
 CFLAGS+= -I${SYSROOT:U${DESTDIR}}/usr/include/openssl
 CFLAGS+= -DHAVE_LIBCRYPTO -DHAVE_OPENSSL_EVP_H
+CFLAGS+= -DOPENSSL_API_COMPAT=0x10100000L
 .endif
 
 .if ${MK_PF} != "no"