diff --git a/security/openfortivpn/Makefile b/security/openfortivpn/Makefile
index e9f4da01f83b..0e94e48435c8 100644
--- a/security/openfortivpn/Makefile
+++ b/security/openfortivpn/Makefile
@@ -1,31 +1,31 @@
 PORTNAME=	openfortivpn
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.23.1
 CATEGORIES=	security net-vpn
 
 MAINTAINER=	atanubiswas484@gmail.com
 COMMENT=	Client for PPP+SSL VPN tunnel services
 WWW=		https://github.com/adrienverge/openfortivpn
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	gsed:textproc/gsed
 
 USES=		autoreconf cpe pkgconfig ssl
 CPE_VENDOR=	${PORTNAME}_project
 USE_GITHUB=	yes
 GH_ACCOUNT=	adrienverge
 
 GNU_CONFIGURE=	yes
 CONFIGURE_ENV=	ac_cv_path_SED=${LOCALBASE}/bin/gsed \
-		OPENSSL_CFLAGS=${OPENSSLINC} \
+		OPENSSL_CFLAGS=-I${OPENSSLINC} \
 		OPENSSL_LIBS="-L${OPENSSLLIB} -lssl -lcrypto" \
 		ac_cv_header_net_route_h=yes
 
 post-install:
 	${MV} ${STAGEDIR}${ETCDIR}/config ${STAGEDIR}${ETCDIR}/config.sample
 	${RM} ${STAGEDIR}${DATADIR}/config.template
 	${RMDIR} ${STAGEDIR}${DATADIR}
 
 .include <bsd.port.mk>