diff --git a/tox.ini b/tox.ini
index 0873fead00..7d1bd15326 100644
--- a/tox.ini
+++ b/tox.ini
@@ -97,6 +97,10 @@ commands = {posargs}
 commands = {envpython} {toxinidir}/manage.py {posargs}
 
 [testenv:cover]
+# NOTE(jaegerandi): This target does not use constraints
+# because upstream infra does not yet support it. Once that's fixed, we can
+# drop the install_command.
+install_command = pip install -U --force-reinstall {opts} {packages}
 commands =
   coverage erase
   coverage run {toxinidir}/manage.py test horizon --settings=horizon.test.settings {posargs}