diff --git a/graphics/vulkan-loader/Makefile b/graphics/vulkan-loader/Makefile
index af763d804de7..03128b68aa46 100644
--- a/graphics/vulkan-loader/Makefile
+++ b/graphics/vulkan-loader/Makefile
@@ -1,49 +1,47 @@
 PORTNAME=	vulkan-loader
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.2.197
 CATEGORIES=	graphics devel
 
 PATCH_SITES=	https://github.com/${GH_ACCOUNT}/${GH_PROJECT}/commit/
 PATCHFILES+=	b8ee23e4d5ac.patch:-p1 # https://github.com/KhronosGroup/Vulkan-Loader/pull/738
 
 MAINTAINER=	jbeich@FreeBSD.org
 COMMENT=	Driver loader for the Vulkan graphics API
 
 LICENSE=	APACHE20
 
 BUILD_DEPENDS=	vulkan-headers>0:graphics/vulkan-headers
 
 USES=		alias cmake compiler:${ARCH:Mi386:C/.+/gcc-/}c++11-lib pkgconfig python:3.4+,build
 USE_GITHUB=	yes
 USE_LDCONFIG=	yes
 GH_ACCOUNT=	KhronosGroup
 GH_PROJECT=	Vulkan-Loader
 CMAKE_ON=	CMAKE_SKIP_RPATH
 CMAKE_OFF=	BUILD_TESTS
 
 OPTIONS_DEFINE=	WAYLAND XCB XLIB
 OPTIONS_DEFAULT=WAYLAND XCB XLIB
 
 WAYLAND_LIB_DEPENDS=	libwayland-client.so:graphics/wayland
 WAYLAND_CMAKE_BOOL=	BUILD_WSI_WAYLAND_SUPPORT
 
 XCB_DESC=		${X11_DESC} via libxcb
 XCB_USES=		xorg
 XCB_USE=		XORG=xcb
 XCB_CMAKE_BOOL=		BUILD_WSI_XCB_SUPPORT
 
 XLIB_DESC=		${X11_DESC} via libX11
 XLIB_USES=		xorg
 XLIB_USE=		XORG=x11,xrandr
 XLIB_CMAKE_BOOL=	BUILD_WSI_XLIB_SUPPORT
 
 post-patch:
-# _XOPEN_SOURCE enforces X/Open-compliance but alloca isn't there
-	@${REINPLACE_CMD} '/_XOPEN_SOURCE/d' ${WRKSRC}/loader/CMakeLists.txt
 # Extract (snapshot) version from the port
 	@${REINPLACE_CMD} -e '/find_.*Git/d' \
 		-e '/BRANCH/s/--unknown--/main/' \
 		-e '/TAG/s/--unknown--/${DISTVERSIONFULL}/' \
 		${WRKSRC}/CMakeLists.txt
 
 .include <bsd.port.mk>