diff --git a/src/scrapy_redis/scheduler.py b/src/scrapy_redis/scheduler.py
index 23d94f8a..ba50a101 100644
--- a/src/scrapy_redis/scheduler.py
+++ b/src/scrapy_redis/scheduler.py
@@ -37,6 +37,7 @@ def __init__(
         flush_on_start=False,
         queue_key=defaults.SCHEDULER_QUEUE_KEY,
         queue_cls=defaults.SCHEDULER_QUEUE_CLASS,
+        dupefilter=None,
         dupefilter_key=defaults.SCHEDULER_DUPEFILTER_KEY,
         dupefilter_cls=defaults.SCHEDULER_DUPEFILTER_CLASS,
         idle_before_close=0,
@@ -56,6 +57,8 @@ def __init__(
             Requests queue key.
         queue_cls : str
             Importable path to the queue class.
+        dupefilter: Dupefilter
+            Custom dupefilter instance.
         dupefilter_key : str
             Duplicates filter key.
         dupefilter_cls : str
@@ -106,9 +109,9 @@ def from_settings(cls, settings):
             if val:
                 kwargs[name] = val
 
-        dupefilter_cls = load_object(kwargs['dupefilter_cls'])
-        if not hasattr(dupefilter_cls, 'from_spider'):
-            kwargs['dupefilter'] = dupefilter_cls.from_settings(settings)
+        dupefilter_cls = load_object(kwargs["dupefilter_cls"])
+        if not hasattr(dupefilter_cls, "from_spider"):
+            kwargs["dupefilter"] = dupefilter_cls.from_settings(settings)
 
         # Support serializer as a path to a module.
         if isinstance(kwargs.get("serializer"), str):