diff --git a/math/py-pdal/Makefile b/math/py-pdal/Makefile
index 782859a3ed60..53c43950b4cd 100644
--- a/math/py-pdal/Makefile
+++ b/math/py-pdal/Makefile
@@ -20,7 +20,7 @@ LIB_DEPENDS=	libpdal_base.so:math/pdal
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}packaging>=0:devel/py-packaging@${PY_FLAVOR} \
 		${PYNUMPY}
 
-USES=		python
+USES=		python:3.6+
 USE_PYTHON=	autoplist cython distutils
 
 post-install: