diff --git a/tox.ini b/tox.ini
index d02c6b8..3db18ed 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,6 +15,7 @@ deps =
     ci: python-openid
     ci: python-openid-teams
     ci: python-openid-cla
+install_command = pip install --no-use-pep517 {opts} {packages}
 setenv =
     PAGURE_CONFIG={toxinidir}/tests/test_config
     PYTHONPATH={toxinidir}