diff --git a/tox.ini b/tox.ini
index f2da20398..e52388591 100644
--- a/tox.ini
+++ b/tox.ini
@@ -137,7 +137,7 @@ deps =
   tox
 commands =
   tox -e vendor
-  git diff --quiet
+  git diff --exit-code
 
 [testenv:docs]
 changedir = docs