diff --git a/backend/open_webui/routers/retrieval.py b/backend/open_webui/routers/retrieval.py
index 1ff4cef3e..44b570ff6 100644
--- a/backend/open_webui/routers/retrieval.py
+++ b/backend/open_webui/routers/retrieval.py
@@ -1971,6 +1971,7 @@ async def process_web(
                     docs,
                     collection_name,
                     overwrite=overwrite,
+                    add=(not overwrite),
                     user=user,
                 )
             else: