diff --git a/astro/py-astropy/Makefile b/astro/py-astropy/Makefile
index 2670e50ed650..599e7fd9459c 100644
--- a/astro/py-astropy/Makefile
+++ b/astro/py-astropy/Makefile
@@ -18,7 +18,7 @@ LICENSE_FILE=	${WRKSRC}/licenses/LICENSE.rst
 BUILD_DEPENDS=	${PYNUMPY}
 RUN_DEPENDS=	${PYNUMPY}
 
-USES=		python
+USES=		python:-3.6
 USE_PYTHON=	autoplist distutils
 
 .include <bsd.port.mk>