diff --git a/crates/js-sys/src/lib.rs b/crates/js-sys/src/lib.rs
index 89169596..e402b6ab 100644
--- a/crates/js-sys/src/lib.rs
+++ b/crates/js-sys/src/lib.rs
@@ -3496,7 +3496,7 @@ pub mod Intl {
         /// that enable language sensitive number formatting.
         ///
         /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NumberFormat
-        #[wasm_bindgen(js_namespace = Intl)]
+        #[wasm_bindgen(extends = Object, js_namespace = Intl)]
         #[derive(Clone, Debug)]
         pub type NumberFormat;
 
diff --git a/crates/js-sys/tests/wasm/Intl.rs b/crates/js-sys/tests/wasm/Intl.rs
index 62f6102f..8abff50b 100644
--- a/crates/js-sys/tests/wasm/Intl.rs
+++ b/crates/js-sys/tests/wasm/Intl.rs
@@ -72,6 +72,10 @@ fn number_format() {
 
     let a = Intl::NumberFormat::supported_locales_of(&locales, &opts);
     assert!(a.is_instance_of::<Array>());
+
+    assert!(n.is_instance_of::<Intl::NumberFormat>());
+    assert!(n.is_instance_of::<Object>());
+    let _: &Object = n.as_ref();
 }
 
 #[wasm_bindgen_test]