diff --git a/src/domain/acme/manager.rs b/src/domain/acme/manager.rs
index 2a93bf9..78ae80e 100644
--- a/src/domain/acme/manager.rs
+++ b/src/domain/acme/manager.rs
@@ -1,8 +1,8 @@
-use std::{future, pin, sync, time};
+use std::{sync, time};
 
-use crate::domain::acme::{Certificate, PrivateKey};
-use crate::domain::{self, acme};
+use crate::domain::acme::{self, Certificate, PrivateKey};
 use crate::error::unexpected::{self, Intoable, Mappable};
+use crate::{domain, util};
 
 const LETS_ENCRYPT_URL: &str = "https://acme-v02.api.letsencrypt.org/directory";
 
@@ -14,7 +14,8 @@ pub trait Manager {
     fn sync_domain<'mgr>(
         &'mgr self,
         domain: domain::Name,
-    ) -> pin::Pin<Box<dyn future::Future<Output = Result<(), unexpected::Error>> + Send + 'mgr>>;
+    ) -> util::BoxedFuture<'mgr, Result<(), unexpected::Error>>;
+
     fn get_http01_challenge_key(&self, token: &str) -> Result<String, GetHttp01ChallengeKeyError>;
 
     /// Returned vec is guaranteed to have len > 0
@@ -86,8 +87,7 @@ impl Manager for ManagerImpl {
     fn sync_domain<'mgr>(
         &'mgr self,
         domain: domain::Name,
-    ) -> pin::Pin<Box<dyn future::Future<Output = Result<(), unexpected::Error>> + Send + 'mgr>>
-    {
+    ) -> util::BoxedFuture<'mgr, Result<(), unexpected::Error>> {
         Box::pin(async move {
             // if there's an existing cert, and its expiry (determined by the soonest value of
             // not_after amongst its parts) is later than 30 days from now, then we consider it to be
diff --git a/src/domain/manager.rs b/src/domain/manager.rs
index 13d5b71..96d666f 100644
--- a/src/domain/manager.rs
+++ b/src/domain/manager.rs
@@ -3,7 +3,7 @@ use crate::error::unexpected::{self, Mappable};
 use crate::origin;
 use crate::util;
 
-use std::{future, pin, sync};
+use std::sync;
 use tokio_util::sync::CancellationToken;
 
 #[derive(thiserror::Error, Debug)]
@@ -146,13 +146,13 @@ pub trait Manager: Sync + Send + rustls::server::ResolvesServerCert {
     fn sync_cert<'mgr>(
         &'mgr self,
         domain: domain::Name,
-    ) -> pin::Pin<Box<dyn future::Future<Output = Result<(), unexpected::Error>> + Send + 'mgr>>;
+    ) -> util::BoxedFuture<'mgr, Result<(), unexpected::Error>>;
 
     fn sync_with_config<'mgr>(
         &'mgr self,
         domain: domain::Name,
         config: config::Config,
-    ) -> pin::Pin<Box<dyn future::Future<Output = Result<(), SyncWithConfigError>> + Send + 'mgr>>;
+    ) -> util::BoxedFuture<'mgr, Result<(), SyncWithConfigError>>;
 
     fn get_acme_http01_challenge_key(
         &self,
@@ -244,8 +244,7 @@ impl Manager for ManagerImpl {
     fn sync_cert<'mgr>(
         &'mgr self,
         domain: domain::Name,
-    ) -> pin::Pin<Box<dyn future::Future<Output = Result<(), unexpected::Error>> + Send + 'mgr>>
-    {
+    ) -> util::BoxedFuture<'mgr, Result<(), unexpected::Error>> {
         Box::pin(async move {
             if let Some(ref acme_manager) = self.acme_manager {
                 acme_manager.sync_domain(domain.clone()).await?;
@@ -259,8 +258,7 @@ impl Manager for ManagerImpl {
         &'mgr self,
         domain: domain::Name,
         config: config::Config,
-    ) -> pin::Pin<Box<dyn future::Future<Output = Result<(), SyncWithConfigError>> + Send + 'mgr>>
-    {
+    ) -> util::BoxedFuture<'mgr, Result<(), SyncWithConfigError>> {
         Box::pin(async move {
             let config_hash = config
                 .hash()
diff --git a/src/util.rs b/src/util.rs
index 9b1b153..1c3afb4 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -12,13 +12,13 @@ pub fn open_file(path: &path::Path) -> io::Result<Option<fs::File>> {
     }
 }
 
-type StaticFuture<O> = pin::Pin<Box<dyn futures::Future<Output = O> + Send + 'static>>;
+pub type BoxedFuture<'a, O> = pin::Pin<Box<dyn futures::Future<Output = O> + Send + 'a>>;
 
 pub struct TaskStack<E>
 where
     E: error::Error + Send + 'static,
 {
-    wait_group: Vec<StaticFuture<Result<(), E>>>,
+    wait_group: Vec<BoxedFuture<'static, Result<(), E>>>,
 }
 
 impl<E> TaskStack<E>