diff --git a/devel/libcbor/Makefile b/devel/libcbor/Makefile
index 6460e3a6c5ab..460fb2662868 100644
--- a/devel/libcbor/Makefile
+++ b/devel/libcbor/Makefile
@@ -1,28 +1,30 @@
 PORTNAME=	libcbor
 PORTVERSION=	0.9.0
 DISTVERSIONPREFIX=	v
 CATEGORIES=	devel
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	CBOR protocol implementation for C and others
 WWW=		https://github.com/PJK/libcbor
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE.md
 
 LIB_DEPENDS=	libcjson.so:devel/libcjson
 
 USES=		cmake
 
 CMAKE_OFF=	CBOR_CUSTOM_ALLOC COVERAGE HUGE_FUZZ PRINT_FUZZ SANE_MALLOC SANITIZE WITH_EXAMPLES WITH_TESTS
 CMAKE_ON=	BUILD_SHARED_LIBS CBOR_PRETTY_PRINTER
 
 PLIST_SUB=	PORTVERSION=${PORTVERSION}
 
 GH_ACCOUNT=	PJK
 USE_GITHUB=	yes
 
 post-patch:
 	@${REINPLACE_CMD} -e 's|-flto||; /subdirs(examples)/d' ${WRKSRC}/CMakeLists.txt
+	@${REINPLACE_CMD} -e 's|();|(void);|' ${WRKSRC}/src/cbor/*.h ${WRKSRC}/src/cbor/internal/*.h
+	@${REINPLACE_CMD} -e 's|() {|(void) {|' ${WRKSRC}/src/cbor/*.c ${WRKSRC}/src/cbor/internal/*.c
 
 .include <bsd.port.mk>