diff --git a/math/py-ducc0/Makefile b/math/py-ducc0/Makefile
index b4f4c4160f4f..b23c22f8736e 100644
--- a/math/py-ducc0/Makefile
+++ b/math/py-ducc0/Makefile
@@ -1,33 +1,35 @@
 PORTNAME=	ducc0
 DISTVERSION=	0.18.0
 CATEGORIES=	math
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Distinctly Useful Code Collection (DUCC)
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+BROKEN_FreeBSD_11=	ducc.o: file not recognized: File format not recognized
+
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pybind11>0:devel/py-pybind11@${PY_FLAVOR}
 
 USES=		python:3.6+
 
 USE_PYTHON=	distutils autoplist
 
 MAKE_ENV=	DUCC0_OPTIMIZATION=none
 
 .include <bsd.port.options.mk>
 
 .if ${ARCH:Mpowerpc64*}
 CFLAGS+=	-DNO_WARN_X86_INTRINSICS
 USES+=		compiler:gcc-c++11-lib
 .else
 USES+=		compiler:c++17-lang
 .endif
 
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PYTHON_SITELIBDIR}/ducc0*.so
 
 .include <bsd.port.mk>