diff --git a/spotify_model/track.py b/spotify_model/track.py
index 403ef44..1e44a70 100644
--- a/spotify_model/track.py
+++ b/spotify_model/track.py
@@ -25,7 +25,7 @@ class SimplifiedTrack(BaseModel):
     is_playable: Optional[bool]
     linked_from: Optional[str]
     name: str
-    preview_url: str
+    preview_url: Optional[str]
     restrictions: Optional[str]
     track_number: int
     type_: str = Field(alias="type")