diff --git a/libexec/mail.local/Makefile b/libexec/mail.local/Makefile
index 3e59609e893e..345e2a4603a8 100644
--- a/libexec/mail.local/Makefile
+++ b/libexec/mail.local/Makefile
@@ -12,6 +12,13 @@ CFLAGS+=-I${SENDMAIL_DIR}/include -I.
 WARNS?=	2
 WFORMAT=0
 
+.if ${CC:T:Mclang} == "clang"
+# Unfortunately, clang gives warnings about sendmail code that cannot
+# be turned off yet.  Since this is contrib code, and we don't really
+# care about the warnings, just turn make them non-fatal for now.
+NO_WERROR=
+.endif
+
 LIBSMDIR=	${.OBJDIR}/../../lib/libsm
 LIBSM=		${LIBSMDIR}/libsm.a