diff --git a/devel/cargo-c/Makefile b/devel/cargo-c/Makefile
index df6d6d36d8a7..621e276b6aab 100644
--- a/devel/cargo-c/Makefile
+++ b/devel/cargo-c/Makefile
@@ -1,32 +1,39 @@
 PORTNAME=	cargo-c
 DISTVERSION=	0.9.24
 DISTVERSIONSUFFIX=	+cargo-0.73.0
 PORTREVISION=	2
 CATEGORIES=	devel
 MASTER_SITES=	CRATESIO
 # XXX Teach USES=cargo to have proper default
 DISTFILES=	${CARGO_DIST_SUBDIR}/${DISTNAME}${CARGO_CRATE_EXT}
 
 MAINTAINER=	jbeich@FreeBSD.org
 COMMENT=	Cargo C-ABI helpers
 WWW=		https://github.com/lu-zero/cargo-c
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 LIB_DEPENDS=	libgit2.so:devel/libgit2 \
 		libcurl.so:ftp/curl \
 		libssh2.so:security/libssh2
 
 USES=		cargo ssl
 PLIST_FILES=	bin/cargo-capi \
 		bin/cargo-cbuild \
 		bin/cargo-cinstall \
 		bin/cargo-ctest \
 		${NULL}
 
+.include <bsd.port.pre.mk>
+
+# prevent address space exhaustion on armv6/armv7
+.if ${ARCH:Marmv?}
+LTO_UNSAFE=	yes
+.endif
+
 post-patch:
 	@${REINPLACE_CMD} -e 's,libdir.join("pkgconfig,prefix.join("libdata/pkgconfig,' \
 		${WRKSRC}/src/install.rs
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>