diff --git a/tox.ini b/tox.ini
index c2c1839f6..ed4716c76 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,10 @@ skipsdist = True
 [testenv]
 skip_install = True
 sitepackages = True
-passenv = LANG GNOCCHI_TEST_* AWS_*
+passenv =
+    LANG
+    GNOCCHI_TEST_*
+    AWS_*
 setenv =
     GNOCCHI_TEST_STORAGE_DRIVER=file
     GNOCCHI_TEST_INDEXER_DRIVER=postgresql