diff --git a/whisper/transcribe.py b/whisper/transcribe.py
index 3887433..d23e92a 100644
--- a/whisper/transcribe.py
+++ b/whisper/transcribe.py
@@ -279,7 +279,7 @@ class Transcriber(metaclass=PassthroughPropertyDefaults):
     _initial_finalized: bool = False
     _all_tokens: Optional[list] = None
 
-    @property
+    @PassthroughProperty[Optional[list]](None).property
     def all_tokens(self):
         if self._all_tokens is None:
             self._all_tokens = []