diff --git a/audio/celt/Makefile b/audio/celt/Makefile
index bd19bcba94f6..7d6c50108623 100644
--- a/audio/celt/Makefile
+++ b/audio/celt/Makefile
@@ -12,6 +12,9 @@ COMMENT=	The CELT ultra-low delay audio codec
 LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKSRC}/COPYING
 
+DEPRECATED=	Deprecated by upstream in in 2016 in favour of (lib)opus
+EXPIRATION_DATE=2021-12-31
+
 LIB_DEPENDS=	libogg.so:audio/libogg
 
 GNU_CONFIGURE=	yes