diff --git a/src/api/quotes/schemas.py b/src/api/quotes/schemas.py
index 9b7e7c7..4f9fd22 100644
--- a/src/api/quotes/schemas.py
+++ b/src/api/quotes/schemas.py
@@ -18,7 +18,7 @@ class QuoteCollectionsResponse(QuoteResponse):
 
 class QuoteCreateRequest(BaseModel):
     content: str
-    author_id: int | None
+    author_id: int | None = None
 
 
 class QuoteUpdateRequest(BaseModel):