diff --git a/net/py-pcapy/Makefile b/net/py-pcapy/Makefile
index 63bb506310ef..d1378500f8ee 100644
--- a/net/py-pcapy/Makefile
+++ b/net/py-pcapy/Makefile
@@ -1,29 +1,35 @@
 PORTNAME=	pcapy
 PORTVERSION=	0.11.1
 CATEGORIES=	net python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	anastasios@mageirias.com
 COMMENT=	Python pcap extension
 WWW=		http://www.coresecurity.com/corelabs-research/open-source-tools/pcapy
 
 LICENSE=	APACHE11
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 USES=		python:3.6+ dos2unix
 USE_PYTHON=	autoplist distutils
 
 DOCSDIR=	${PREFIX}/share/doc/py-${PORTNAME}
 PORTDOCS=	README pcapy.html
 
 OPTIONS_DEFINE=	DOCS
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400091
+CPPFLAGS+=  -Dregister=
+.endif
+
 post-install:
 	@${STRIP_CMD} ${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/pcapy*.so
 
 post-install-DOCS-on:
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${PORTDOCS:S,^,${WRKSRC}/,} ${STAGEDIR}${DOCSDIR}
 
 .include <bsd.port.mk>