diff --git a/packages/fbjs/src/__forks__/Promise.native.js b/packages/fbjs/src/__forks__/Promise.native.js
index 00ba5059..7f26bf48 100644
--- a/packages/fbjs/src/__forks__/Promise.native.js
+++ b/packages/fbjs/src/__forks__/Promise.native.js
@@ -18,8 +18,13 @@ require('promise/setimmediate/done');
 /**
  * Handle either fulfillment or rejection with the same callback.
  */
-Promise.prototype.finally = function(onSettled) {
-  return this.then(onSettled, onSettled);
-};
+Promise.prototype.finally = function(callback) {
+  return this.then(
+    value => Promise.resolve(callback()).then(() => value),
+    reason => Promise.resolve(callback()).then(() => {
+      throw reason;
+    })
+  );
+}
 
 module.exports = Promise;