diff --git a/crates/js-sys/src/lib.rs b/crates/js-sys/src/lib.rs
index 249e89a4812..4506cd726d2 100644
--- a/crates/js-sys/src/lib.rs
+++ b/crates/js-sys/src/lib.rs
@@ -4254,6 +4254,7 @@ extern "C" {
     ///
     /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)
     #[wasm_bindgen(extends = Object)]
+    #[derive(Clone, Debug)]
     pub type Promise;
 
     /// Creates a new `Promise` with the provided executor `cb`