diff --git a/tox.ini b/tox.ini
index 58594a1ee..82c33a969 100644
--- a/tox.ini
+++ b/tox.ini
@@ -162,7 +162,7 @@ commands =
 
 [testenv:pyinstaller]
 basepython = python3
--skip_install = true
+skip_install = true
 deps =
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/misc/requirements/requirements-pyinstaller.txt