diff --git a/tox.ini b/tox.ini
index ff94e95..8fa6954 100644
--- a/tox.ini
+++ b/tox.ini
@@ -41,7 +41,9 @@ commands        = mypy -p setools -p setoolsgui -p tests
 
 [testenv:install]
 deps            = {[testenv]deps}
-commands        = {envpython} -m pip install --use-pep517 .
+allowlist_externals = find
+commands        = {envpython} -m pip install --use-pep517 --root {envtmpdir}/setools .
+                  find {envtmpdir}/setools
 
 [testenv]
 passenv         = USERSPACE_SRC