diff --git a/aider/history.py b/aider/history.py
index 131cf4b31..7532380be 100644
--- a/aider/history.py
+++ b/aider/history.py
@@ -108,7 +108,11 @@ class ChatSummary:
 
         for model in self.models:
             try:
-                summary = simple_send_with_retries(model.name, summarize_messages)
+                summary = simple_send_with_retries(
+                    model.name,
+                    summarize_messages,
+                    extra_headers=model.extra_headers
+                )
                 if summary is not None:
                     summary = prompts.summary_prefix + summary
                     return [dict(role="user", content=summary)]