diff --git a/lang/mlton/Makefile b/lang/mlton/Makefile
index 69eea5c49316..cc1865f96ca5 100644
--- a/lang/mlton/Makefile
+++ b/lang/mlton/Makefile
@@ -21,6 +21,8 @@ EXTRACT_ONLY=	${SRC_DIST}
 MAINTAINER=	MLton@mlton.org
 COMMENT=	An optimizing Standard ML compiler
 
+BROKEN=		Size mismatch
+
 BUILD_DEPENDS=	bash:${PORTSDIR}/shells/bash2		\
 		hevea:${PORTSDIR}/textproc/hevea 	\
 		latex:${PORTSDIR}/print/teTeX