diff --git a/src/mako/api/api.rs.mako b/src/mako/api/api.rs.mako
index d735276985..e7a37ea3da 100644
--- a/src/mako/api/api.rs.mako
+++ b/src/mako/api/api.rs.mako
@@ -50,7 +50,7 @@ ${lib.hub_usage_example(c)}\
 </%block>
 pub struct ${hub_type}${ht_params} {
     client: RefCell<C>,
-    auth: RefCell<oauth2::authenticator::Authenticator<hyper_rustls::HttpsConnector<hyper::client::connect::HttpConnector>>>,
+    auth: oauth2::authenticator::Authenticator<hyper_rustls::HttpsConnector<hyper::client::connect::HttpConnector>>,
     _user_agent: String,
     _base_url: String,
     _root_url: String,
@@ -64,7 +64,7 @@ impl<'a, ${', '.join(HUB_TYPE_PARAMETERS)}> ${hub_type}${ht_params}
     pub fn new(client: C, authenticator: oauth2::authenticator::Authenticator<hyper_rustls::HttpsConnector<hyper::client::connect::HttpConnector>>) -> ${hub_type}${ht_params} {
         ${hub_type} {
             client: RefCell::new(client),
-            auth: RefCell::new(authenticator),
+            auth: authenticator,
             _user_agent: "${default_user_agent}".to_string(),
             _base_url: "${baseUrl}".to_string(),
             _root_url: "${rootUrl}".to_string(),
diff --git a/src/mako/api/lib/mbuild.mako b/src/mako/api/lib/mbuild.mako
index 887065b6df..7415ccb4a8 100644
--- a/src/mako/api/lib/mbuild.mako
+++ b/src/mako/api/lib/mbuild.mako
@@ -451,7 +451,7 @@ match result {
 
     delegate = 'self.' + property(DELEGATE_PROPERTY_NAME)
     delegate_finish = 'dlg.finished'
-    auth_call = 'self.hub.auth.borrow_mut()'
+    auth_call = 'self.hub.auth'
 
     default_scope = method_default_scope(m)
 
@@ -700,8 +700,7 @@ else {
 
         loop {
             % if default_scope:
-            let authenticator = ${auth_call};
-            let token = match authenticator.token(&self.${api.properties.scopes}.keys().collect::<Vec<_>>()[..]).await {
+            let token = match ${auth_call}.token(&self.${api.properties.scopes}.keys().collect::<Vec<_>>()[..]).await {
                 Ok(token) => token.clone(),
                 Err(err) => {
                     match  dlg.token(&err) {
@@ -841,12 +840,11 @@ else {
                                 dlg.store_upload_url(Some(url_str));
                             }
 
-                            drop(authenticator);
                             client::ResumableUploadHelper {
                                 client: &mut client.borrow_mut(),
                                 delegate: dlg,
                                 start_at: if upload_url_from_server { Some(0) } else { None },
-                                auth: &mut *${auth_call},
+                                auth: &${auth_call},
                                 user_agent: &self.hub._user_agent,
                                 auth_header: format!("Bearer {}", token.as_str()),
                                 url: url_str,
diff --git a/src/rust/api/client.rs b/src/rust/api/client.rs
index e1ad6cf5c0..84d05dfda6 100644
--- a/src/rust/api/client.rs
+++ b/src/rust/api/client.rs
@@ -613,7 +613,7 @@ pub struct ResumableUploadHelper<'a, A: 'a> {
     >,
     pub delegate: &'a mut dyn Delegate,
     pub start_at: Option<u64>,
-    pub auth: &'a mut A,
+    pub auth: &'a A,
     pub user_agent: &'a str,
     pub auth_header: String,
     pub url: &'a str,