diff --git a/secret_store/src/key_server_cluster/io/deadline.rs b/secret_store/src/key_server_cluster/io/deadline.rs
index 501a69057..10f485b7d 100644
--- a/secret_store/src/key_server_cluster/io/deadline.rs
+++ b/secret_store/src/key_server_cluster/io/deadline.rs
@@ -19,7 +19,7 @@ use std::time::Duration;
 use futures::{Future, Select, BoxFuture, Poll, Async};
 use tokio_core::reactor::{Handle, Timeout};
 
-type DeadlineBox<F> where F: Future = BoxFuture<DeadlineStatus<F::Item>, F::Error>;
+type DeadlineBox<F> = BoxFuture<DeadlineStatus<<F as Future>::Item>, <F as Future>::Error>;
 
 /// Complete a passed future or fail if it is not completed within timeout.
 pub fn deadline<F, T>(duration: Duration, handle: &Handle, future: F) -> Result<Deadline<F>, io::Error>