diff --git a/docs/API.md b/docs/API.md
index 46a2a53c5..2406e692f 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -383,7 +383,7 @@ policy_read_only = {"Version":"2012-10-17",
                     ]}
 
 
-minioClient.set_bucket_policy('mybucket', policy_read_only)
+minioClient.set_bucket_policy('mybucket', json.dumps(policy_read_only))
 ```
 
 <a name="get_bucket_notification"></a>