diff --git a/awx/api/serializers.py b/awx/api/serializers.py
index cf136bff89..bb2db24313 100644
--- a/awx/api/serializers.py
+++ b/awx/api/serializers.py
@@ -1018,7 +1018,7 @@ class ActivityStreamSerializer(BaseSerializer):
         rel['object_1'] = reverse('api:' + obj1_resolution + '_detail', args=(obj.object1_id,))
         if obj.operation in ('associate', 'disassociate'):
             obj2_resolution = camelcase_to_underscore(obj.object2_type.split(".")[-1])
-            rel['object_2'] = reverse('api:' + obj2_resolution + '_detail', args(obj.object2_id,))
+            rel['object_2'] = reverse('api:' + obj2_resolution + '_detail', args=(obj.object2_id,))
         return rel
 
     def get_summary_fields(self, obj):