1 files changed, 1 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index c7e333c5..3f05700a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -190,6 +190,7 @@ import_exceptions = designate.i18n
 
 [testenv:lower-constraints]
 basepython = python3
+install_command = pip install {opts} {packages}
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt