diff --git a/types/chai-as-promised/chai-as-promised-tests.ts b/types/chai-as-promised/chai-as-promised-tests.ts
index 7e422521aa..2157f0cc3c 100644
--- a/types/chai-as-promised/chai-as-promised-tests.ts
+++ b/types/chai-as-promised/chai-as-promised-tests.ts
@@ -26,6 +26,7 @@ thenableNum = chai.expect(thenableNum).to.notify(() => console.log('done'));
 // BDD API (should)
 thenableNum = thenableNum.should.be.fulfilled;
 thenableNum = thenableNum.should.eventually.deep.equal(3);
+thenableNum = thenableNum.should.eventually.become(3);
 thenableNum = thenableNum.should.become(3);
 thenableNum = thenableNum.should.be.rejected;
 thenableNum = thenableNum.should.be.rejectedWith(Error);
diff --git a/types/chai-as-promised/index.d.ts b/types/chai-as-promised/index.d.ts
index bd67bf90cd..459758aa55 100644
--- a/types/chai-as-promised/index.d.ts
+++ b/types/chai-as-promised/index.d.ts
@@ -3,6 +3,7 @@
 // Definitions by: jt000 <https://github.com/jt000>,
 //                 Yuki Kokubun <https://github.com/Kuniwak>,
 //                 Leonard Thieu <https://github.com/leonard-thieu>,
+//                 Mike Lazer-Walker <https://github.com/lazerwalker>,
 //                 Matt Bishop <https://github.com/mattbishop>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
@@ -28,14 +29,14 @@ declare namespace Chai {
         become(expected: any): PromisedAssertion;
         fulfilled: PromisedAssertion;
         rejected: PromisedAssertion;
-        rejectedWith(expected: any, message?: string | RegExp): PromisedAssertion;
+        rejectedWith: PromisedThrow;
         notify(fn: Function): PromisedAssertion;
     }
 
     // Eventually does not have .then(), but PromisedAssertion have.
     interface Eventually extends PromisedLanguageChains, PromisedNumericComparison, PromisedTypeComparison {
         // From chai-as-promised
-        become(expected: PromiseLike<any>): PromisedAssertion;
+        become(expected: any): PromisedAssertion;
         fulfilled: PromisedAssertion;
         rejected: PromisedAssertion;
         rejectedWith: PromisedThrow;