diff --git a/tox.ini b/tox.ini
index a29004afb..ad9e074b1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -21,6 +21,7 @@ passenv =
     PRE_COMMIT_HOME
     REQUESTS_CA_BUNDLE
     CURL_CA_BUNDLE
+    USING_CONDA
 extras =
     # TODO: Uncomment `all` once all the extensions are updated
     #       to the new version of pyscaffold