diff --git a/math/py-primecountpy/Makefile b/math/py-primecountpy/Makefile
index 010bb1fe081c..043460252558 100644
--- a/math/py-primecountpy/Makefile
+++ b/math/py-primecountpy/Makefile
@@ -1,31 +1,33 @@
 PORTNAME=	primecountpy
 PORTVERSION=	0.2.1
 CATEGORIES=	math python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	thierry@FreeBSD.org
 COMMENT=	Primecount Cython interface
 WWW=		https://pypi.org/project/primecountpy/
 
 LICENSE=	GPLv3
 
 BUILD_DEPENDS=	${PYDEPS}
 LIB_DEPENDS=	libprimecount.so:math/primecount
 RUN_DEPENDS=	${PYDEPS}
 
 USES=		cmake:indirect localbase meson pkgconfig python
 USE_PYTHON=	cython
+BINARY_ALIAS=	cython=cython-${PYTHON_VER}
+
 .if !defined(WITH_DEBUG)
 LDFLAGS+=	-s
 .endif
 
 PYDEPS=	${PYTHON_PKGNAMEPREFIX}cysignals>0:devel/py-cysignals@${PY_FLAVOR}
 
 post-build:
 	${FIND} ${WRKSRC} -name "*gnu.so" -delete -o -name "*313.pyc" -delete
 
 post-stage:
 	${FIND} ${STAGEDIR} -name "*.cpp" -delete -o -name "*.pyx" -delete
 
 .include <bsd.port.mk>