diff --git a/secure/lib/libcrypto/Makefile.inc b/secure/lib/libcrypto/Makefile.inc
index 5562062963d..311a5813d7d 100644
--- a/secure/lib/libcrypto/Makefile.inc
+++ b/secure/lib/libcrypto/Makefile.inc
@@ -7,7 +7,7 @@ LCRYPTO_DOC=	${.CURDIR}/../../../crypto/openssl/doc
 
 CFLAGS+=	-DTERMIOS -DANSI_SOURCE
 CFLAGS+=	-I${LCRYPTO_SRC} -I${LCRYPTO_SRC}/crypto -I${.OBJDIR}
-CFLAGS+=	-DOPENSSL_THREADS
+CFLAGS+=	-DOPENSSL_THREADS -DDSO_DLFCN -DHAVE_DLFCN_H
 
 .if ${MK_IDEA} == "no"
 CFLAGS+=	-DOPENSSL_NO_IDEA