diff --git a/libexec/tcpd/Makefile b/libexec/tcpd/Makefile
index 74c689174136..c91256132112 100644
--- a/libexec/tcpd/Makefile
+++ b/libexec/tcpd/Makefile
@@ -4,6 +4,7 @@ MAINTAINER=	markm@FreeBSD.org
 
 PROG=	tcpd
 MAN=	tcpd.8
+CSTD?=	c89
 CFLAGS+=-DREAL_DAEMON_DIR=\"/usr/libexec\" \
 	-DSEVERITY=LOG_INFO -DRFC931_TIMEOUT=10 \
 	-DHOSTS_DENY=\"/etc/hosts.deny\" -DHOSTS_ALLOW=\"/etc/hosts.allow\" \