diff --git a/math/octave-forge-optim/Makefile b/math/octave-forge-optim/Makefile
index 8e0de72da161..b4b2601eb9f1 100644
--- a/math/octave-forge-optim/Makefile
+++ b/math/octave-forge-optim/Makefile
@@ -1,26 +1,28 @@
 PORTNAME=	octave-forge-optim
 PORTVERSION=	1.6.2
 PORTREVISION=	4
 CATEGORIES=	math
 MASTER_SITES=	SF/octave/Octave%20Forge%20Packages/Individual%20Package%20Releases
 DISTNAME=	${OCTAVE_PKGNAME}-${DISTVERSIONFULL}
 
 MAINTAINER=	stephen@FreeBSD.org
 COMMENT=	Octave-forge package ${OCTAVE_PKGNAME}
 WWW=		https://packages.octave.org/
 
 LICENSE=	Parts
 LICENSE_NAME=	See individual files for licenses
 LICENSE_FILE=	${WRKDIR}/${OCTAVE_SRC}/COPYING
 LICENSE_PERMS=	dist-mirror dist-sell pkg-mirror pkg-sell auto-accept
 
+BROKEN=		does not build with octave version >= 10.1.0
+
 RUN_DEPENDS=	${OCTAVE_TARBALLS_DIR}/statistics.tar.gz:math/octave-forge-statistics \
 		${OCTAVE_TARBALLS_DIR}/struct.tar.gz:math/octave-forge-struct
 
 USES=		octave shebangfix
 
 SHEBANG_FILES=	*.pl
 
 GNU_CONFIGURE=	yes
 
 .include <bsd.port.mk>