diff --git a/backend/open_webui/routers/retrieval.py b/backend/open_webui/routers/retrieval.py
index 98f79c7fe..07938f22f 100644
--- a/backend/open_webui/routers/retrieval.py
+++ b/backend/open_webui/routers/retrieval.py
@@ -1835,6 +1835,7 @@ class QueryCollectionsForm(BaseModel):
     k_reranker: Optional[int] = None
     r: Optional[float] = None
     hybrid: Optional[bool] = None
+    hybrid_bm25_weight: Optional[float] = None
 
 
 @router.post("/query/collection")