1 files changed, 2 insertions, 1 deletions
diff --git a/tox.ini b/tox.ini
index 15e54c767..112deee3f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,8 +19,9 @@ deps =
      {coverage,diffcov}: coverage
      pg: psycopg2
      diffcov: diff_cover
-passenv=
+passenv =
     MAILMAN_*
+    PYTHON*
 setenv =
     coverage: COVERAGE_PROCESS_START={[coverage]rcfile}
     coverage: COVERAGE_OPTIONS="-p"