diff --git a/net/owamp/Makefile b/net/owamp/Makefile
index 0e42b00f76e2..060efaff951b 100644
--- a/net/owamp/Makefile
+++ b/net/owamp/Makefile
@@ -1,14 +1,20 @@
 PORTNAME=	owamp
 PORTVERSION=	3.3
 CATEGORIES=	net
 MASTER_SITES=	http://software.internet2.edu/sources/owamp/
 
 MAINTAINER=	pi@FreeBSD.org
 COMMENT=	Implementation of the One-Way Active Measurement Protocol
 WWW=		https://www.internet2.edu/performance/owamp/
 
 LICENSE=	APACHE20
 
 GNU_CONFIGURE=	yes
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400079 || ( ${OSVERSION} >= 1302505 && ${OSVERSION} < 1400000 ))
+CFLAGS+=	-Wno-error=int-conversion
+.endif
+
 .include <bsd.port.mk>