diff --git a/src/test/ui/async-await/async-await.rs b/src/test/ui/async-await/async-await.rs
index 1dc7315e88c..0207752afe0 100644
--- a/src/test/ui/async-await/async-await.rs
+++ b/src/test/ui/async-await/async-await.rs
@@ -1,5 +1,8 @@
 // run-pass
 
+// revisions: default nomiropt
+//[nomiropt]compile-flags: -Z mir-opt-level=0
+
 #![allow(unused)]
 
 // edition:2018
diff --git a/src/test/ui/async-await/async-closure.rs b/src/test/ui/async-await/async-closure.rs
index 9a24bd8c954..12d66b19e07 100644
--- a/src/test/ui/async-await/async-closure.rs
+++ b/src/test/ui/async-await/async-closure.rs
@@ -1,5 +1,8 @@
 // run-pass
 
+// revisions: default nomiropt
+//[nomiropt]compile-flags: -Z mir-opt-level=0
+
 // edition:2018
 // aux-build:arc_wake.rs
 
diff --git a/src/test/ui/async-await/drop-order/drop-order-for-async-fn-parameters.rs b/src/test/ui/async-await/drop-order/drop-order-for-async-fn-parameters.rs
index 00072786a50..6c10ead3690 100644
--- a/src/test/ui/async-await/drop-order/drop-order-for-async-fn-parameters.rs
+++ b/src/test/ui/async-await/drop-order/drop-order-for-async-fn-parameters.rs
@@ -2,6 +2,9 @@
 // edition:2018
 // run-pass
 
+// revisions: default nomiropt
+//[nomiropt]compile-flags: -Z mir-opt-level=0
+
 #![allow(unused_variables)]
 
 // Test that the drop order for parameters in a fn and async fn matches up. Also test that
diff --git a/src/test/ui/async-await/drop-order/drop-order-for-temporary-in-tail-return-expr.rs b/src/test/ui/async-await/drop-order/drop-order-for-temporary-in-tail-return-expr.rs
index e40acff6dc1..4ec43708584 100644
--- a/src/test/ui/async-await/drop-order/drop-order-for-temporary-in-tail-return-expr.rs
+++ b/src/test/ui/async-await/drop-order/drop-order-for-temporary-in-tail-return-expr.rs
@@ -2,6 +2,9 @@
 // edition:2018
 // run-pass
 
+// revisions: default nomiropt
+//[nomiropt]compile-flags: -Z mir-opt-level=0
+
 #![allow(unused_variables)]
 
 // Test the drop order for parameters relative to local variables and
diff --git a/src/test/ui/async-await/drop-order/drop-order-when-cancelled.rs b/src/test/ui/async-await/drop-order/drop-order-when-cancelled.rs
index 9e8304935bf..cfd68bc0d23 100644
--- a/src/test/ui/async-await/drop-order/drop-order-when-cancelled.rs
+++ b/src/test/ui/async-await/drop-order/drop-order-when-cancelled.rs
@@ -2,6 +2,9 @@
 // edition:2018
 // run-pass
 
+// revisions: default nomiropt
+//[nomiropt]compile-flags: -Z mir-opt-level=0
+
 // Test that the drop order for parameters in a fn and async fn matches up. Also test that
 // parameters (used or unused) are not dropped until the async fn is cancelled.
 // This file is mostly copy-pasted from drop-order-for-async-fn-parameters.rs