diff --git a/multimedia/phonon/Makefile b/multimedia/phonon/Makefile
index e1aa76acc376..bf39783fee05 100644
--- a/multimedia/phonon/Makefile
+++ b/multimedia/phonon/Makefile
@@ -1,35 +1,41 @@
 PORTNAME=	phonon
 DISTVERSION=	4.11.1
 CATEGORIES=	multimedia kde
 MASTER_SITES=	KDE/stable/${PORTNAME}/${DISTVERSION}
 DIST_SUBDIR=	KDE/phonon
 PKGNAMESUFFIX=	-qt5
 
 MAINTAINER=	kde@FreeBSD.org
 COMMENT=	KDE multimedia framework
 WWW=		https://userbase.kde.org/Phonon
 
 LICENSE=	LGPL21+
 LICENSE_FILE=	${WRKSRC}/COPYING.LIB
 
 USES=		cmake compiler:c++11-lang kde:5 pathfix qt:5 tar:xz
 CMAKE_ON=	PHONON_INSTALL_QT_EXTENSIONS_INTO_SYSTEM_QT \
 		PHONON_NO_PLATFORMPLUGIN \
 		PHONON_BUILD_PHONON4QT5
 CMAKE_OFF=	PHONON_BUILD_DESIGNER_PLUGIN \
 		PHONON_BUILD_DECLARATIVE_PLUGIN
 USE_LDCONFIG=	yes
 USE_KDE=	ecm
 USE_QT=		core dbus gui opengl widgets \
 		buildtools:build qmake:build
 
 PLIST_SUB=	SHLIB_VER=${DISTVERSION}
 
 OPTIONS_DEFINE=	PULSEAUDIO
 
 PULSEAUDIO_LIB_DEPENDS=	libpulse.so:audio/pulseaudio
 PULSEAUDIO_USES=	gnome
 PULSEAUDIO_USE=		GNOME=glib20
 PULSEAUDIO_CMAKE_BOOL=	WITH_PulseAudio
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400091
+CXXFLAGS+=	-Wno-error=enum-constexpr-conversion
+.endif
+
 .include <bsd.port.mk>