diff --git a/bundles/left4me/items.py b/bundles/left4me/items.py
index 777bb13..7daee66 100644
--- a/bundles/left4me/items.py
+++ b/bundles/left4me/items.py
@@ -84,6 +84,7 @@ files = {
         'mode': '0440',
         'owner': 'root',
         'group': 'root',
+        'test_with': 'visudo -cf {}',
     },
     '/etc/sysctl.d/99-left4me.conf': {
         'source': 'etc/sysctl.d/99-left4me.conf',