diff --git a/usr.sbin/sendmail/Makefile b/usr.sbin/sendmail/Makefile
index 458000be7aaf..ba49431d293e 100644
--- a/usr.sbin/sendmail/Makefile
+++ b/usr.sbin/sendmail/Makefile
@@ -36,7 +36,6 @@ NIS=	-DNIS
 # Map extensions
 MAPS=	-DMAP_REGEX -DDNSMAP
 
-CSTD?=	c89
 CFLAGS+= -I${SMDIR} -I${SENDMAIL_DIR}/include -I.
 CFLAGS+= ${DBMDEF} ${NIS} -DTCPWRAPPERS ${MAPS}