diff --git a/src/async_impl/upgrade.rs b/src/async_impl/upgrade.rs
index 5b9cf12a5..4a69b4db5 100644
--- a/src/async_impl/upgrade.rs
+++ b/src/async_impl/upgrade.rs
@@ -64,9 +64,10 @@ impl From<hyper::upgrade::Upgraded> for Upgraded {
 
 impl super::response::Response {
     /// Consumes the response and returns a future for a possible HTTP upgrade.
-    pub fn upgrade(self) -> impl futures_core::Future<Output = crate::Result<Upgraded>> {
+    pub async fn upgrade(self) -> crate::Result<Upgraded> {
         hyper::upgrade::on(self.res)
             .map_ok(Upgraded::from)
             .map_err(crate::error::upgrade)
+            .await
     }
 }