diff --git a/videodb/collection.py b/videodb/collection.py
index 0921c7f..c070a07 100644
--- a/videodb/collection.py
+++ b/videodb/collection.py
@@ -273,7 +273,7 @@ def generate_voice(
     def generate_video(
         self,
         prompt: str,
-        duration: float,
+        duration: float = 5,
         callback_url: Optional[str] = None,
     ) -> Video:
         """