diff --git a/datadog/api/api_client.py b/datadog/api/api_client.py
index d09460658..a38a308fa 100644
--- a/datadog/api/api_client.py
+++ b/datadog/api/api_client.py
@@ -158,7 +158,8 @@ def submit(cls, method, path, api_version=None, body=None, attach_host_name=Fals
                 response_obj = None
 
             if response_obj:
-                response_obj['response_headers'] = response_headers
+                for response in response_obj:
+                    response['response_headers'] = response_headers
 
             if response_formatter is None:
                 return response_obj