diff --git a/mail/datovka/Makefile b/mail/datovka/Makefile
index b9b2c561db02..12435d8572dc 100644
--- a/mail/datovka/Makefile
+++ b/mail/datovka/Makefile
@@ -1,22 +1,28 @@
 PORTNAME=	datovka
 DISTVERSION=	4.22.1
 CATEGORIES=	mail
 MASTER_SITES=	https://secure.nic.cz/files/datove_schranky/${DISTVERSION}/
 
 MAINTAINER=	freebsd@sysctl.cz
 COMMENT=	Qt re-implementation of Datovka
 WWW=		https://gitlab.nic.cz/datovka/datovka
 
 LICENSE=	LGPL3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 BUILD_DEPENDS=	libglvnd>0:graphics/libglvnd \
 		pkgconf:devel/pkgconf
 LIB_DEPENDS=	libdatovka.so:devel/libdatovka
 
 USES=		desktop-file-utils gl pkgconfig qmake qt:5 ssl tar:xz
 USE_GL=		gl
 USE_QT=		buildtools core gui network printsupport sql svg websockets \
 		widgets
 
-.include <bsd.port.mk>
+.include <bsd.port.pre.mk>
+
+.if ( ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400092 && ${SSL_DEFAULT} == base ) || ${SSL_DEFAULT:Mopenssl3*}
+CXXFLAGS+=	-DOPENSSL_API_COMPAT=0x30000000L"
+.endif
+
+.include <bsd.port.post.mk>