diff --git a/futures/tests/async_await_macros.rs b/futures/tests/async_await_macros.rs
index 3102341e29..3c275de4d3 100644
--- a/futures/tests/async_await_macros.rs
+++ b/futures/tests/async_await_macros.rs
@@ -278,7 +278,7 @@ fn select_on_non_unpin_size() {
         select_res
     };
 
-    assert_eq!(48, std::mem::size_of_val(&fut));
+    assert_eq!(32, std::mem::size_of_val(&fut));
 }
 
 #[cfg(all(feature = "async-await", feature = "std", feature = "executor"))]