diff --git a/fastapi_pagination/ext/pymongo.py b/fastapi_pagination/ext/pymongo.py
index 7c0943d3..a506504e 100644
--- a/fastapi_pagination/ext/pymongo.py
+++ b/fastapi_pagination/ext/pymongo.py
@@ -28,7 +28,6 @@ def paginate(
     params, raw_params = verify_params(params, "limit-offset")
 
     query_filter = query_filter or {}
-    filter_fields = filter_fields or {}
 
     total = collection.count_documents(query_filter) if raw_params.include_total else None
     cursor = collection.find(