diff --git a/math/py-iohexperimenter/Makefile b/math/py-iohexperimenter/Makefile
index 5ecea77cad18..aed098789269 100644
--- a/math/py-iohexperimenter/Makefile
+++ b/math/py-iohexperimenter/Makefile
@@ -16,9 +16,10 @@ LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}numpy>=0,1:math/py-numpy@${PY_FLAVOR}
 
 USES=		compiler:c++14-lang dos2unix python:3.7+
-USE_PYTHON=	autoplist concurrent distutils
+USE_PYTHON=	autoplist concurrent distutils unittest
 
 USE_CXXSTD=	c++14
+TEST_ENV=	PYTHONPATH=${STAGEDIR}${PYTHON_SITELIBDIR}/IOHexperimenter
 
 post-install:
 	${FIND} ${STAGEDIR}${PYTHON_SITELIBDIR} -name '*.so' -exec ${STRIP_CMD} {} +