diff --git a/fastapi/security/oauth2.py b/fastapi/security/oauth2.py
index 08737924e4..42674b476c 100644
--- a/fastapi/security/oauth2.py
+++ b/fastapi/security/oauth2.py
@@ -690,4 +690,4 @@ class SecurityScopes:
                 separated by spaces, as defined in the OAuth2 specification.
                 """
             ),
-        ] = " ".join(self.scopes)
\ No newline at end of file
+        ] = " ".join(self.scopes)