diff --git a/bluebird/index.d.ts b/bluebird/index.d.ts
index 3508a4e742..e9a79d8834 100644
--- a/bluebird/index.d.ts
+++ b/bluebird/index.d.ts
@@ -533,11 +533,11 @@ declare class Bluebird<R> implements Bluebird.Thenable<R>, Bluebird.Inspection<R
    *
    * Note: In 1.x and 0.x Promise.join used to be a Promise.all that took the values in as arguments instead in an array. This behavior has been deprecated but is still supported partially - when the last argument is an immediate function value the new semantics will apply
    */
-  static join<R, A1>(arg1: A1 | Bluebird.Thenable<A1>, handler: (arg1?: A1) => R | Bluebird.Thenable<R>): Bluebird<R>;
-  static join<R, A1, A2>(arg1: A1 | Bluebird.Thenable<A1>, arg2: A2 | Bluebird.Thenable<A2>, handler: (arg1?: A1, arg2?: A2) => R | Bluebird.Thenable<R>): Bluebird<R>;
-  static join<R, A1, A2, A3>(arg1: A1 | Bluebird.Thenable<A1>, arg2: A2 | Bluebird.Thenable<A2>, arg3: A3 | Bluebird.Thenable<A3>, handler: (arg1?: A1, arg2?: A2, arg3?: A3) => R | Bluebird.Thenable<R>): Bluebird<R>;
-  static join<R, A1, A2, A3, A4>(arg1: A1 | Bluebird.Thenable<A1>, arg2: A2 | Bluebird.Thenable<A2>, arg3: A3 | Bluebird.Thenable<A3>, arg4: A4 | Bluebird.Thenable<A4>, handler: (arg1?: A1, arg2?: A2, arg3?: A3, arg4?: A4) => R | Bluebird.Thenable<R>): Bluebird<R>;
-  static join<R, A1, A2, A3, A4, A5>(arg1: A1 | Bluebird.Thenable<A1>, arg2: A2 | Bluebird.Thenable<A2>, arg3: A3 | Bluebird.Thenable<A3>, arg4: A4 | Bluebird.Thenable<A4>, arg5: A5 | Bluebird.Thenable<A5>, handler: (arg1?: A1, arg2?: A2, arg3?: A3, arg4?: A4, arg5?: A5) => R | Bluebird.Thenable<R>): Bluebird<R>;
+  static join<R, A1>(arg1: A1 | Bluebird.Thenable<A1>, handler: (arg1: A1) => R | Bluebird.Thenable<R>): Bluebird<R>;
+  static join<R, A1, A2>(arg1: A1 | Bluebird.Thenable<A1>, arg2: A2 | Bluebird.Thenable<A2>, handler: (arg1: A1, arg2: A2) => R | Bluebird.Thenable<R>): Bluebird<R>;
+  static join<R, A1, A2, A3>(arg1: A1 | Bluebird.Thenable<A1>, arg2: A2 | Bluebird.Thenable<A2>, arg3: A3 | Bluebird.Thenable<A3>, handler: (arg1: A1, arg2: A2, arg3: A3) => R | Bluebird.Thenable<R>): Bluebird<R>;
+  static join<R, A1, A2, A3, A4>(arg1: A1 | Bluebird.Thenable<A1>, arg2: A2 | Bluebird.Thenable<A2>, arg3: A3 | Bluebird.Thenable<A3>, arg4: A4 | Bluebird.Thenable<A4>, handler: (arg1: A1, arg2: A2, arg3: A3, arg4: A4) => R | Bluebird.Thenable<R>): Bluebird<R>;
+  static join<R, A1, A2, A3, A4, A5>(arg1: A1 | Bluebird.Thenable<A1>, arg2: A2 | Bluebird.Thenable<A2>, arg3: A3 | Bluebird.Thenable<A3>, arg4: A4 | Bluebird.Thenable<A4>, arg5: A5 | Bluebird.Thenable<A5>, handler: (arg1: A1, arg2: A2, arg3: A3, arg4: A4, arg5: A5) => R | Bluebird.Thenable<R>): Bluebird<R>;
 
   // variadic array
   /** @deprecated use .all instead */