diff --git a/devel/flatcc/Makefile b/devel/flatcc/Makefile
index 0c7c3cab89ec..14e640037264 100644
--- a/devel/flatcc/Makefile
+++ b/devel/flatcc/Makefile
@@ -1,30 +1,30 @@
 PORTNAME=	flatcc
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.6.1
 CATEGORIES=	devel
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	FlatBuffers compiler and library in C for C
 WWW=		https://github.com/dvidelabs/flatcc
 
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 USES=		cmake compiler:c++11-lib
 USE_LDCONFIG=	yes
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	dvidelabs
 
 CMAKE_ON=	BUILD_SHARED_LIBS FLATCC_INSTALL
-CMAKE_OFF=	FLATCC_TEST
+CMAKE_OFF=	FLATCC_TEST FLATCC_ALLOW_WERROR
 
 PLIST_SUB=	SUFFIX=${WITH_DEBUG:D_d}
 
 do-test:
 	@cd ${BUILD_WRKSRC} && \
 		${SETENV} ${CONFIGURE_ENV} ${CMAKE_BIN} ${CMAKE_ARGS} -DFLATCC_TEST:BOOL=ON ${CMAKE_SOURCE_PATH} && \
 		${SETENV} ${MAKE_ENV} ${MAKE_CMD} ${MAKE_ARGS} ${ALL_TARGET} && \
 		${SETENV} ${MAKE_ENV} ${MAKE_CMD} ${MAKE_ARGS} test
 
 .include <bsd.port.mk>