diff --git a/components/script/dom/promise.rs b/components/script/dom/promise.rs
index 1ac1aa52a45..80b62f161bc 100644
--- a/components/script/dom/promise.rs
+++ b/components/script/dom/promise.rs
@@ -411,10 +411,12 @@ impl FromJSValConvertibleRc for Promise {
             return Ok(ConversionResult::Failure("not an object".into()));
         }
         rooted!(in(cx) let obj = value.get().to_object());
-        if !IsPromiseObject(obj.handle()) {
-            return Ok(ConversionResult::Failure("not a promise".into()));
-        }
-        let promise = Promise::new_with_js_promise(obj.handle(), SafeJSContext::from_ptr(cx));
+
+        let cx = SafeJSContext::from_ptr(cx);
+        let in_realm_proof = AlreadyInRealm::assert_for_cx(cx);
+        let global_scope = GlobalScope::from_context(*cx, InRealm::Already(&in_realm_proof));
+
+        let promise = Promise::new_resolved(&global_scope, cx, *obj, CanGc::note());
         Ok(ConversionResult::Success(promise))
     }
 }
diff --git a/tests/wpt/meta/clipboard-apis/clipboard-item.https.html.ini b/tests/wpt/meta/clipboard-apis/clipboard-item.https.html.ini
index a76ef482f19..2a5d4f9792e 100644
--- a/tests/wpt/meta/clipboard-apis/clipboard-item.https.html.ini
+++ b/tests/wpt/meta/clipboard-apis/clipboard-item.https.html.ini
@@ -2,9 +2,6 @@
   [ClipboardItem({string, Blob}) succeeds with different types]
     expected: FAIL
 
-  [ClipboardItem() succeeds with empty options]
-    expected: FAIL
-
   [types() returns correct values]
     expected: FAIL