diff --git a/types/blob-util/blob-util-tests.ts b/types/blob-util/blob-util-tests.ts
index af860a7ee1..d05b401116 100644
--- a/types/blob-util/blob-util-tests.ts
+++ b/types/blob-util/blob-util-tests.ts
@@ -13,5 +13,6 @@ blobUtil.blobToBase64String(testBlob); // $ExpectType Promise<string>
 blobUtil.blobToBinaryString(testBlob); // $ExpectType Promise<string>
 blobUtil.canvasToBlob(new HTMLCanvasElement()); // $ExpectType Promise<Blob>
 blobUtil.dataURLToBlob('data:abcd'); // $ExpectType Promise<Blob>
+blobUtil.blobToDataURL(testBlob); // $ExpectType Promise<string>
 blobUtil.imgSrcToDataURL('test.jpg'); // $ExpectType Promise<string>
 blobUtil.revokeObjectURL('blob:example'); // $ExpectType void
diff --git a/types/blob-util/index.d.ts b/types/blob-util/index.d.ts
index ce99c3d893..362b8e012f 100644
--- a/types/blob-util/index.d.ts
+++ b/types/blob-util/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for blob-util 1.2
+// Type definitions for blob-util 1.3
 // Project: https://github.com/nolanlawson/blob-util#readme
 // Definitions by: Max Battcher <https://github.com/WorldMaker>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -12,6 +12,7 @@ export function binaryStringToBlob(binary: string, type?: string): Promise<Blob>
 export function blobToBase64String(blob: Blob): Promise<string>;
 export function base64StringToBlob(base64: string, type?: string): Promise<Blob>;
 export function dataURLToBlob(dataURL: string): Promise<Blob>;
+export function blobToDataURL(blob: Blob): Promise<string>;
 export function imgSrcToDataURL(src: string, type?: string, crossOrigin?: string): Promise<string>;
 export function canvasToBlob(canvas: HTMLCanvasElement, type?: string): Promise<Blob>;
 export function imgSrcToBlob(src: string, type?: string, crossOrigin?: string): Promise<Blob>;