diff --git a/faster_whisper/transcribe.py b/faster_whisper/transcribe.py
index 4d7f0f6..3973fe6 100644
--- a/faster_whisper/transcribe.py
+++ b/faster_whisper/transcribe.py
@@ -79,7 +79,7 @@ class WhisperModel:
         cpu_threads: int = 0,
         num_workers: int = 1,
         download_root: Optional[str] = None,
-        local_files_only: Optional[bool] = False,
+        local_files_only: bool = False,
     ):
         """Initializes the Whisper model.
 
diff --git a/faster_whisper/utils.py b/faster_whisper/utils.py
index 34a310a..a052ad8 100644
--- a/faster_whisper/utils.py
+++ b/faster_whisper/utils.py
@@ -34,7 +34,7 @@ def get_logger():
 def download_model(
     size: str,
     output_dir: Optional[str] = None,
-    local_files_only: Optional[bool] = False,
+    local_files_only: bool = False,
     cache_dir: Optional[str] = None,
 ):
     """Downloads a CTranslate2 Whisper model from the Hugging Face Hub.