diff --git a/fastapi/security/oauth2.py b/fastapi/security/oauth2.py
index 43bfd4354..010019901 100644
--- a/fastapi/security/oauth2.py
+++ b/fastapi/security/oauth2.py
@@ -471,8 +471,9 @@ class OAuth2PasswordBearer(OAuth2):
         flows = OAuthFlowsModel(
             password=cast(
                 Any,
-                {"tokenUrl": tokenUrl, "refreshUrl": refreshUrl, "scopes": scopes} if refreshUrl else
-                {"tokenUrl": tokenUrl, "scopes": scopes}
+                {"tokenUrl": tokenUrl, "refreshUrl": refreshUrl, "scopes": scopes}
+                if refreshUrl
+                else {"tokenUrl": tokenUrl, "scopes": scopes},
             )
         )
         super().__init__(