diff --git a/typescript/phaser.comments.d.ts b/typescript/phaser.comments.d.ts
index d48b7f4ca..170585e38 100644
--- a/typescript/phaser.comments.d.ts
+++ b/typescript/phaser.comments.d.ts
@@ -20528,7 +20528,7 @@ declare module Phaser {
         * @param state Generator state to be set.
         * @return The current state of the generator.
         */
-        state(state: string): string;
+        state(state?: string): string;
 
         /**
         * Returns a random timestamp between min and max, or between the beginning of 2000 and the end of 2020 if min and max aren't specified.
diff --git a/typescript/phaser.d.ts b/typescript/phaser.d.ts
index 2830202af..dd025ede9 100644
--- a/typescript/phaser.d.ts
+++ b/typescript/phaser.d.ts
@@ -3803,7 +3803,7 @@ declare module Phaser {
         real(): number;
         realInRange(min: number, max: number): number;
         sow(seeds: number[]): void;
-        state(state: string): string;
+        state(state?: string): string;
         timestamp(min: number, max: number): number;
         uuid(): number;
         weightedPick<T>(ary: T[]): T;