diff --git a/libexec/telnetd/Makefile b/libexec/telnetd/Makefile
index 0c5b23ed7ee..031000d0cff 100644
--- a/libexec/telnetd/Makefile
+++ b/libexec/telnetd/Makefile
@@ -14,6 +14,7 @@ CFLAGS+=	-DLINEMODE -DUSE_TERMIO -DDIAGNOSTICS -DOLD_ENVIRON \
 		-I${.CURDIR}/../../lib -DINET6
 
 WARNS?=		2
+WFORMAT?=	0
 
 .if exists(${.OBJDIR}/../../lib/libtelnet)
 LIBTELNET=	${.OBJDIR}/../../lib/libtelnet/libtelnet.a
diff --git a/secure/libexec/telnetd/Makefile b/secure/libexec/telnetd/Makefile
index ef9d1b2e5fe..07378fd6d13 100644
--- a/secure/libexec/telnetd/Makefile
+++ b/secure/libexec/telnetd/Makefile
@@ -14,6 +14,7 @@ CFLAGS+=	-DLINEMODE -DUSE_TERMIO -DDIAGNOSTICS -DOLD_ENVIRON \
 		-I${TELNETDIR} -DINET6
 
 WARNS?=		2
+WFORMAT?=	0
 
 DPADD=		${LIBUTIL} ${LIBTERMCAP} ${LIBTELNET} ${LIBMP} ${LIBCRYPTO} \
 		${LIBCRYPT} ${LIBPAM}