diff --git a/security/libfido2/Makefile b/security/libfido2/Makefile
index b4c9d9f2765f..df04268c3626 100644
--- a/security/libfido2/Makefile
+++ b/security/libfido2/Makefile
@@ -1,36 +1,39 @@
 PORTNAME=	libfido2
 PORTVERSION=	1.15.0
 CATEGORIES=	security
 MASTER_SITES=	https://developers.yubico.com/libfido2/Releases/
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Provides library functionality for FIDO 2.0
 WWW=		https://developers.yubico.com/libfido2/ \
 		https://github.com/Yubico/libfido2
 
 LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 LIB_DEPENDS=	libcbor.so:devel/libcbor
 
 USES=		cmake:testing compiler:c11 pathfix pkgconfig ssl
 
 CFLAGS+=	-DOPENSSL_API_COMPAT=0x10100000L
 CMAKE_OFF=	BUILD_TESTS \
 		FUZZ \
 		NFC_LINUX \
 		USE_HIDAPI \
 		USE_PCSC \
 		USE_WINHELLO
 CMAKE_ON=	BUILD_EXAMPLES \
 		BUILD_MANPAGES \
 		BUILD_SHARED_LIBS \
 		BUILD_STATIC_LIBS \
 		BUILD_TOOLS
 CMAKE_TESTING_ON=	BUILD_TESTS
 
 PLIST_SUB=	PORTVERSION=${PORTVERSION}
 
 OPTIONS_DEFINE=	DOCS
 
+post-patch:
+	@${REINPLACE_CMD} -e 's|-D_POSIX_C_SOURCE=200809L|-D_POSIX_C_SOURCE=202405L|' ${WRKSRC}/CMakeLists.txt
+
 .include <bsd.port.mk>