diff --git a/devel/cpprestsdk/Makefile b/devel/cpprestsdk/Makefile
index 3f9753b2b540..9b706ecc5c52 100644
--- a/devel/cpprestsdk/Makefile
+++ b/devel/cpprestsdk/Makefile
@@ -1,29 +1,31 @@
 PORTNAME=	cpprestsdk
 PORTVERSION=	2.10.16
 DISTVERSIONPREFIX=	v
 CATEGORIES=	devel
 
 MAINTAINER=	projects@phess.net
 COMMENT=	Microsoft C++ REST SDK
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/../license.txt
 
 BUILD_DEPENDS=	${LOCALBASE}/include/websocketpp/client.hpp:devel/websocketpp
 LIB_DEPENDS=	libboost_system.so:devel/boost-libs
 
+BROKEN=		error: performing pointer subtraction with a null pointer may have undefined behavior
+
 USES=		cmake compiler:c++11-lang pkgconfig ssl
 USE_LDCONFIG=	yes
 USE_GITHUB=	yes
 GH_ACCOUNT=	Microsoft
 WRKSRC_SUBDIR=	Release
 CMAKE_OFF=	BUILD_SAMPLES BUILD_TESTS
 
 CXXFLAGS+=	-Wno-c11-extensions
 
 OPTIONS_DEFINE=	BROTLI
 
 BROTLI_LIB_DEPENDS=	libbrotlidec.so:archivers/brotli
 BROTLI_CMAKE_ON=	-DCPPREST_EXCLUDE_BROTLI:BOOL=OFF
 
 .include <bsd.port.mk>