diff --git a/examples/simple.rs b/examples/simple.rs
index afcd84906..cb6ac0435 100644
--- a/examples/simple.rs
+++ b/examples/simple.rs
@@ -82,7 +82,7 @@ async fn main() {
         .unwrap();
     ctx.configure().await;
 
-    thread::sleep(duration);
+    async_std::task::sleep(duration).await;
 
     println!("sending a message");
     let contact_id = Contact::create(&ctx, "dignifiedquire", "dignifiedquire@gmail.com").unwrap();
@@ -101,7 +101,7 @@ async fn main() {
         println!("chat: {} - {:?} - {:?}", i, text1, text2,);
     }
 
-    thread::sleep(duration);
+    async_std::task::sleep(duration).await;
 
     println!("stopping threads");
 
diff --git a/src/imap/idle.rs b/src/imap/idle.rs
index 7c07bbaf9..e8e213104 100644
--- a/src/imap/idle.rs
+++ b/src/imap/idle.rs
@@ -283,7 +283,7 @@ impl Imap {
             // not have entered idle_wait yet, give it some time
             // for that to happen. XXX handle this without extra wait
             // https://github.com/deltachat/deltachat-core-rust/issues/925
-            std::thread::sleep(Duration::from_millis(200));
+            async_std::task::sleep(Duration::from_millis(200)).await;
             info!(context, "low-level: dropping stop-source to interrupt idle");
             std::mem::drop(interrupt)
         }
diff --git a/src/job.rs b/src/job.rs
index 35842d84a..f7b13557f 100644
--- a/src/job.rs
+++ b/src/job.rs
@@ -675,7 +675,7 @@ pub async fn perform_smtp_jobs(context: &Context) {
 }
 
 pub async fn perform_smtp_idle(context: &Context) {
-    info!(context, "SMTP-idle started...",);
+    info!(context, "SMTP-idle started...");
 
     let perform_jobs_needed = context.smtp.state.read().await.perform_jobs_needed.clone();
 
@@ -1027,7 +1027,7 @@ async fn suspend_smtp_thread(context: &Context, suspend: bool) {
             if !context.smtp.state.read().await.doing_jobs {
                 return;
             }
-            std::thread::sleep(time::Duration::from_micros(300 * 1000));
+            async_std::task::sleep(time::Duration::from_micros(300 * 1000)).await;
         }
     }
 }
diff --git a/src/job_thread.rs b/src/job_thread.rs
index 3676eb42e..736f85182 100644
--- a/src/job_thread.rs
+++ b/src/job_thread.rs
@@ -46,7 +46,7 @@ impl JobThread {
             if !using_handle {
                 return;
             }
-            std::thread::sleep(std::time::Duration::from_micros(300 * 1000));
+            async_std::task::sleep(std::time::Duration::from_micros(300 * 1000)).await;
         }
     }