diff --git a/qubes/storage/file.py b/qubes/storage/file.py
index 176b0a26..32b35ace 100644
--- a/qubes/storage/file.py
+++ b/qubes/storage/file.py
@@ -219,6 +219,9 @@ class FileVolume(qubes.storage.Volume):
         if self.snap_on_start or self.save_on_stop:
             _remove_if_exists(self.path_cow)
 
+    def is_outdated(self):
+        return False  # avoid spamming the log with NotImplementedError
+
     def is_dirty(self):
         if self.save_on_stop:
             with suppress(FileNotFoundError), open(self.path_cow, 'rb') as cow: