1 files changed, 3 insertions, 1 deletions

diff --git a/src/regress/lib/libc/sys/Makefile b/src/regress/lib/libc/sys/Makefile
index a00befefd9..c22d08da74 100644
--- a/src/regress/lib/libc/sys/Makefile
+++ b/src/regress/lib/libc/sys/Makefile
@@ -1,4 +1,4 @@
-#       $OpenBSD: Makefile,v 1.4 2020/02/02 20:18:17 bluhm Exp $
+#       $OpenBSD: Makefile,v 1.5 2020/10/06 09:20:29 mpi Exp $
 
 # Copyright (c) 2019 Moritz Buhl <openbsd@moritzbuhl.de>
 # Copyright (c) 2019 Alexander Bluhm <bluhm@openbsd.org>
@@ -49,6 +49,8 @@ PROGS +=	t_unlink
 SRCS_$p =               $p.c atf-c.c
 . endfor
 
+CFLAGS += -std=gnu99
+
 LDADD_t_getpid =        -lpthread
 
 run-t_truncate: setup-t_truncate