diff --git a/tox.ini b/tox.ini
index 281b736..469095b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -21,6 +21,7 @@ basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:spelling]
+basepython = python3
 deps =
    -r{toxinidir}/requirements.txt
    sphinxcontrib-spelling