diff --git a/Libraries/Components/AccessibilityInfo/AccessibilityInfo.ios.js b/Libraries/Components/AccessibilityInfo/AccessibilityInfo.ios.js
index 5a1d64e9595e83..96c586803d42fa 100644
--- a/Libraries/Components/AccessibilityInfo/AccessibilityInfo.ios.js
+++ b/Libraries/Components/AccessibilityInfo/AccessibilityInfo.ios.js
@@ -44,7 +44,7 @@ const AccessibilityInfo = {
    *
    * See http://facebook.github.io/react-native/docs/accessibilityinfo.html#fetch
    */
-  fetch: function(): Promise {
+  fetch: function(): Promise<boolean> {
     return new Promise((resolve, reject) => {
       AccessibilityManager.getCurrentVoiceOverState(resolve, reject);
     });
diff --git a/flow/Promise.js b/flow/Promise.js
index 85d70bd41bae02..ec403388fe9606 100644
--- a/flow/Promise.js
+++ b/flow/Promise.js
@@ -45,3 +45,7 @@ declare class Promise<+R> {
 
   static cast<T>(object?: T): Promise<T>;
 }
+
+declare module 'Promise' {
+  declare module.exports: typeof Promise;
+}