diff --git a/app/controllers/api/v1/webhooks/social_inbox_controller.rb b/app/controllers/api/v1/webhooks/social_inbox_controller.rb
index dec2ee97..fda51f49 100644
--- a/app/controllers/api/v1/webhooks/social_inbox_controller.rb
+++ b/app/controllers/api/v1/webhooks/social_inbox_controller.rb
@@ -89,12 +89,7 @@ module Api
         #
         # @return [String]
         def object_uri
-          @object_uri ||=
-            case original_activity[:object]
-            when Array then original_activity[:object].first
-            when String then original_activity[:object]
-            when Hash then original_activity.dig(:object, :id)
-            end
+          @object_uri ||= ::ActivityPub.uri_from_object(original_activity[:object])
         ensure
           raise ActiveRecord::RecordNotFound, 'object id missing' if @object_uri.blank?
         end
diff --git a/app/models/activity_pub.rb b/app/models/activity_pub.rb
index 1afeee96..86c3f240 100644
--- a/app/models/activity_pub.rb
+++ b/app/models/activity_pub.rb
@@ -24,8 +24,9 @@ class ActivityPub < ApplicationRecord
   # @return [String, nil]
   def self.uri_from_object(object)
     case object
+    when Array then uri_from_object(object.first)
     when String then object
-    when Hash then object['id']
+    when Hash then (object['id'] || object[:id])
     end
   end