diff --git a/tox.ini b/tox.ini
index ce419dcf..2484e81e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -60,6 +60,7 @@ deps =
 use_develop = true
 pass_env =
     CI
+    WEBBPSF_PATH
 set_env =
     devdeps: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
     jwst: CRDS_SERVER_URL=https://jwst-crds.stsci.edu