diff --git a/lib/libarchive/Makefile.inc b/lib/libarchive/Makefile.inc
index 409e1972191d..a03f87d7b6c3 100644
--- a/lib/libarchive/Makefile.inc
+++ b/lib/libarchive/Makefile.inc
@@ -10,6 +10,7 @@ CFLAGS+=	-DPLATFORM_CONFIG_H=\"${.CURDIR}/config_freebsd.h\"
 
 .if ${MK_OPENSSL} != "no"
 CFLAGS+=	-DWITH_OPENSSL
+CFLAGS+=	-DOPENSSL_API_COMPAT=0x10100000L
 LIBADD+=	crypto
 .else
 LIBADD+=	md