diff --git a/src/lib/es5.d.ts b/src/lib/es5.d.ts
index 4f657d4b52b38..54ae1209cb3de 100644
--- a/src/lib/es5.d.ts
+++ b/src/lib/es5.d.ts
@@ -1255,33 +1255,13 @@ declare type PromiseConstructorLike = new <T>(executor: (resolve: (value?: T | P
 
 interface PromiseLike<T> {
     /**
-     * Attaches callbacks for the resolution and/or rejection of the Promise.
-     * @param onfulfilled The callback to execute when the Promise is resolved.
-     * @param onrejected The callback to execute when the Promise is rejected.
-     * @returns A Promise for the completion of which ever callback is executed.
-     */
-    then<TResult1, TResult2>(onfulfilled: (value: T) => TResult1 | PromiseLike<TResult1>, onrejected: (reason: any) => TResult2 | PromiseLike<TResult2>): PromiseLike<TResult1 | TResult2>;
-
-    /**
-     * Attaches callbacks for the resolution and/or rejection of the Promise.
-     * @param onfulfilled The callback to execute when the Promise is resolved.
-     * @param onrejected The callback to execute when the Promise is rejected.
-     * @returns A Promise for the completion of which ever callback is executed.
-     */
-    then<TResult>(onfulfilled: (value: T) => TResult | PromiseLike<TResult>, onrejected: (reason: any) => TResult | PromiseLike<TResult>): PromiseLike<TResult>;
-
-    /**
-     * Attaches callbacks for the resolution and/or rejection of the Promise.
-     * @param onfulfilled The callback to execute when the Promise is resolved.
-     * @returns A Promise for the completion of which ever callback is executed.
-     */
-    then<TResult>(onfulfilled: (value: T) => TResult | PromiseLike<TResult>): PromiseLike<TResult>;
-
-    /**
-     * Creates a new Promise with the same internal state of this Promise.
-     * @returns A Promise.
-     */
-    then(): PromiseLike<T>;
+    * Attaches callbacks for the resolution and/or rejection of the Promise.
+    * @param onfulfilled The callback to execute when the Promise is resolved.
+    * @param onrejected The callback to execute when the Promise is rejected.
+    * @returns A Promise for the completion of which ever callback is executed.
+    */
+    then<TResult>(onfulfilled?: (value: T) => TResult | PromiseLike<TResult>, onrejected?: (reason: any) => TResult | PromiseLike<TResult>): PromiseLike<TResult>;
+    then<TResult>(onfulfilled?: (value: T) => TResult | PromiseLike<TResult>, onrejected?: (reason: any) => void): PromiseLike<TResult>;
 }
 
 interface ArrayLike<T> {