diff --git a/aider/main.py b/aider/main.py
index b040c4194..652425905 100644
--- a/aider/main.py
+++ b/aider/main.py
@@ -358,11 +358,21 @@ def register_models(git_root, model_settings_fname, io, verbose=False):
 
 
 def load_dotenv_files(git_root, dotenv_fname, encoding="utf-8"):
+    # Standard .env file search path
     dotenv_files = generate_search_path_list(
         ".env",
         git_root,
         dotenv_fname,
     )
+
+    # Explicitly add the OAuth keys file to the beginning of the list
+    oauth_keys_file = Path.home() / ".aider" / "oauth-keys.env"
+    if oauth_keys_file.exists():
+        # Insert at the beginning so it's loaded first (and potentially overridden)
+        dotenv_files.insert(0, str(oauth_keys_file.resolve()))
+        # Remove duplicates if it somehow got included by generate_search_path_list
+        dotenv_files = list(dict.fromkeys(dotenv_files))
+
     loaded = []
     for fname in dotenv_files:
         try: