diff --git a/usr.bin/zstd/Makefile b/usr.bin/zstd/Makefile
index 797558940c36..4ecf16f07b40 100644
--- a/usr.bin/zstd/Makefile
+++ b/usr.bin/zstd/Makefile
@@ -1,33 +1,34 @@
 # $FreeBSD$
 
 PROG=	zstd
 SRCS=	\
 	benchfn.c \
 	benchzstd.c \
 	datagen.c \
 	dibio.c \
 	fileio.c \
 	timefn.c \
 	util.c \
 	zstdcli.c
 
 CFLAGS+=	-I${SRCTOP}/sys/contrib/zstd/programs \
 		-I${SRCTOP}/sys/contrib/zstd/lib/common \
 		-I${SRCTOP}/sys/contrib/zstd/lib/compress \
 		-I${SRCTOP}/sys/contrib/zstd/lib/dictBuilder \
 		-I${SRCTOP}/sys/contrib/zstd/lib \
 		-DXXH_NAMESPACE=ZSTD_ \
 		-DHAVE_THREAD=1 \
 		-DZSTD_MULTITHREAD=1
 LINKS=	${BINDIR}/zstd ${BINDIR}/unzstd \
 	${BINDIR}/zstd ${BINDIR}/zstdcat \
 	${BINDIR}/zstd ${BINDIR}/zstdmt
 MLINKS=	zstd.1 unzstd.1 \
 	zstd.1 zstdcat.1 \
 	zstd.1 zstdmt.1
 
+CSTD=c11
 WARNS?=	2
 LIBADD=	zstd
 .PATH: ${SRCTOP}/sys/contrib/zstd/programs
 
 .include <bsd.prog.mk>