diff --git a/kafka/protocol/admin.py b/kafka/protocol/admin.py
index f9d61e5cd..41b4a9576 100644
--- a/kafka/protocol/admin.py
+++ b/kafka/protocol/admin.py
@@ -719,7 +719,7 @@ class DescribeConfigsResponse_v1(Response):
                 ('config_names', String('utf-8')),
                 ('config_value', String('utf-8')),
                 ('read_only', Boolean),
-                ('is_default', Boolean),
+                ('config_source', Int8),
                 ('is_sensitive', Boolean),
                 ('config_synonyms', Array(
                     ('config_name', String('utf-8')),