diff --git a/net/asterisk18/Makefile b/net/asterisk18/Makefile
index db7c8cc7c1e4..c8d81232fe0f 100644
--- a/net/asterisk18/Makefile
+++ b/net/asterisk18/Makefile
@@ -228,7 +228,9 @@ CXX=            clang++${LLVM_VERSION}
 .include <bsd.port.pre.mk>
 
 .if ( ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400092 && ${SSL_DEFAULT} == base ) || ${SSL_DEFAULT:Mopenssl3*}
-CFLAGS+=      -DOPENSSL_API_COMPAT=0x30000000L
+LIB_DEPENDS+=	libgnutls.so:security/gnutls
+CFLAGS+=	-DOPENSSL_API_COMPAT=0x10100000L
+LDFLAGS+=	-lgnutls
 .endif
 
 .if empty(ICONV_LIB)