diff --git a/aider/onboarding.py b/aider/onboarding.py
index e24224c86..8b01679e6 100644
--- a/aider/onboarding.py
+++ b/aider/onboarding.py
@@ -198,7 +198,7 @@ def exchange_code_for_key(code, code_verifier, io):
         return None
     except requests.exceptions.HTTPError as e:
         io.tool_error(
-            f"Error exchanging code for OpenRouter key: {e.status_code} {e.response.reason}"
+            f"Error exchanging code for OpenRouter key: {e.response.status_code} {e.response.reason}"
         )
         io.tool_error(f"Response: {e.response.text}")
         return None