diff --git a/devel/sml_tk/Makefile b/devel/sml_tk/Makefile
index dfd6d4e4e979..ddb1784982fb 100644
--- a/devel/sml_tk/Makefile
+++ b/devel/sml_tk/Makefile
@@ -11,7 +11,7 @@ DISTNAME=	smltk
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Typed and abstract Standard ML interface to Tcl/Tk
 
-USE_TK_WRAPPER=	yes
+USES+=		tk:wrapper
 WRKSRC=		${WRKDIR}/${PORTNAME}
 
 OPTIONS_DEFINE=	SMLNJDEVEL POLYML