diff --git a/qubes/storage/__init__.py b/qubes/storage/__init__.py
index a83c401e2..2db6c656c 100644
--- a/qubes/storage/__init__.py
+++ b/qubes/storage/__init__.py
@@ -1115,6 +1115,8 @@ def _sanitize_config(config):
         if isinstance(value, bool):
             if value:
                 result[key] = "True"
+            else:
+                result[key] = "False"
         else:
             result[key] = str(value)
     return result