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diff --git a/js/src/builtin/Promise-inl.h b/js/src/builtin/Promise-inl.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef builtin_Promise_inl_h
+#define builtin_Promise_inl_h
+
+#include "js/Promise.h"  // JS::PromiseState
+
+#include "mozilla/Assertions.h"  // MOZ_ASSERT
+
+#include "js/RootingAPI.h"     // JS::Handle
+#include "vm/JSContext.h"      // JSContext
+#include "vm/PromiseObject.h"  // js::PromiseObject
+
+namespace js {
+
+/**
+ * Given a settled (i.e. fulfilled or rejected, not pending) promise, sets
+ * |promise.[[PromiseIsHandled]]| to true and removes it from the list of
+ * unhandled rejected promises.
+ *
+ * NOTE: If you need to set |promise.[[PromiseIsHandled]]| on a pending promise,
+ *       use |PromiseObject::setHandled()| directly.
+ */
+inline void SetSettledPromiseIsHandled(
+    JSContext* cx, JS::Handle<PromiseObject*> unwrappedPromise) {
+  MOZ_ASSERT(unwrappedPromise->state() != JS::PromiseState::Pending);
+  unwrappedPromise->setHandled();
+  cx->runtime()->removeUnhandledRejectedPromise(cx, unwrappedPromise);
+}
+
+}  // namespace js
+
+#endif  // builtin_Promise_inl_h