diff --git a/little_boxes/activitypub.py b/little_boxes/activitypub.py
index fb75ea6..b25cc91 100644
--- a/little_boxes/activitypub.py
+++ b/little_boxes/activitypub.py
@@ -157,9 +157,9 @@ def clean_activity(activity: ObjectType) -> Dict[str, Any]:
     """
     for field in ["bto", "bcc", "source"]:
         if field in activity:
-            del (activity[field])
+            del activity[field]
         if activity["type"] == "Create" and field in activity["object"]:
-            del (activity["object"][field])
+            del activity["object"][field]
     return activity
 
 
@@ -465,7 +465,7 @@ class BaseActivity(object, metaclass=_ActivityMeta):
         if embed:
             for k in ["@context", "signature"]:
                 if k in data:
-                    del (data[k])
+                    del data[k]
         if (
             data.get("object")
             and embed_object_id_only