diff --git a/src/bin/upload-speed.rs b/src/bin/upload-speed.rs
index b07615cb..fe20b524 100644
--- a/src/bin/upload-speed.rs
+++ b/src/bin/upload-speed.rs
@@ -1,9 +1,8 @@
 use failure::*;
-use futures::*;
 
 use proxmox_backup::client::*;
 
-fn upload_speed() -> Result<usize, Error> {
+async fn upload_speed() -> Result<usize, Error> {
 
     let host = "localhost";
     let datastore = "store2";
@@ -14,28 +13,22 @@ fn upload_speed() -> Result<usize, Error> {
 
     let backup_time = chrono::Utc::now();
 
-    let client = client.start_backup(datastore, "host", "speedtest", backup_time, false).wait()?;
+    let client = client.start_backup(datastore, "host", "speedtest", backup_time, false).await?;
 
     println!("start upload speed test");
-    let res = client.upload_speedtest().wait()?;
+    let res = client.upload_speedtest().await?;
 
     Ok(res)
 }
 
-fn main()  {
-
-    let mut rt = tokio::runtime::Runtime::new().unwrap();
-
-    // should be rt.block_on_all, but this block forever in release builds
-    let _ = rt.block_on(futures::future::lazy(move || -> Result<(), ()> {
-        match upload_speed() {
-            Ok(mbs) => {
-                println!("average upload speed: {} MB/s", mbs);
-            }
-            Err(err) => {
-                eprintln!("ERROR: {}", err);
-            }
+#[tokio::main]
+async fn main()  {
+    match upload_speed().await {
+        Ok(mbs) => {
+            println!("average upload speed: {} MB/s", mbs);
         }
-        Ok(())
-    }));
+        Err(err) => {
+            eprintln!("ERROR: {}", err);
+        }
+    }
 }