Index: head/devel/tllist/Makefile
===================================================================
--- head/devel/tllist/Makefile	(revision 536176)
+++ head/devel/tllist/Makefile	(revision 536177)
@@ -1,21 +1,22 @@
 # $FreeBSD$
 
 PORTNAME=	tllist
 DISTVERSION=	1.0.0
 CATEGORIES=	devel
 MASTER_SITES=	https://codeberg.org/dnkl/tllist/archive/
 DISTNAME=	${DISTVERSION}
 
 MAINTAINER=	ports@xanderio.de
 COMMENT=	C header file only implementation of a typed linked list
 
 LICENSE=	MIT
 
 USES=		meson
+USE_CSTD=	c99
 
 WRKSRC=		${WRKDIR}/${PORTNAME}
 
 PLIST_FILES=	include/tllist.h \
 		libdata/pkgconfig/tllist.pc
 
 .include <bsd.port.mk>