diff --git a/devel/catch/Makefile b/devel/catch/Makefile
index df4f7b4f3cea..d5c663b7c367 100644
--- a/devel/catch/Makefile
+++ b/devel/catch/Makefile
@@ -1,29 +1,33 @@
 PORTNAME=	catch
 PORTVERSION=	2.13.10
 DISTVERSIONPREFIX=	v
 CATEGORIES=	devel
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Header-only test framework for C++
 WWW=		https://github.com/catchorg/Catch2
 
 LICENSE=	BSL
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
 USES=		cmake compiler:c++14-lang pathfix python:build
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	catchorg
 GH_PROJECT=	Catch2
 
 CMAKE_ARGS=	-DCMAKE_INSTALL_DOCDIR=${DOCSDIR}
 NO_ARCH=	yes
 
 PORTSCOUT=	limit:^2\.
 
 OPTIONS_DEFINE=	DOCS
 
+post-patch:
+	@${REINPLACE_CMD} -e 's/\(-Wno-error=pragmas\)/\1 -Wno-error=c++20-extensions/' \
+		${WRKSRC}/projects/CMakeLists.txt
+
 do-test:
 	${BUILD_WRKSRC}/projects/SelfTest
 
 .include <bsd.port.mk>