diff --git a/src/authenticator.rs b/src/authenticator.rs
index 1057755..97e6ddb 100644
--- a/src/authenticator.rs
+++ b/src/authenticator.rs
@@ -167,9 +167,9 @@ where
     pub fn build(self) -> io::Result<impl GetToken>
     where
         T::TokenGetter: 'static + GetToken,
-        S: 'static + Send,
+        S: 'static,
         AD: 'static,
-        C::Connector: 'static + Clone + Send,
+        C::Connector: 'static + hyper::client::connect::Connect,
     {
         let client = self.client.build_hyper_client();
         let store = self.store?;
diff --git a/src/service_account.rs b/src/service_account.rs
index 545d7f5..ebe938f 100644
--- a/src/service_account.rs
+++ b/src/service_account.rs
@@ -233,7 +233,6 @@ where
     }
 }
 
-#[derive(Clone)]
 struct ServiceAccountAccessImpl<C> {
     client: hyper::Client<C, hyper::Body>,
     key: ServiceAccountKey,