diff --git a/index.d.ts b/index.d.ts
index a9dd5d8..efb19e7 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -262,18 +262,18 @@ declare module looksSame {
         B: number;
     }
 
-    export async function getDiffArea(
+    export function getDiffArea(
         image1: string | Buffer | BoundedImage,
         image2: string | Buffer | BoundedImage
     ): Promise<CoordBounds | null>;
-    export async function getDiffArea(
+    export function getDiffArea(
         image1: string | Buffer | BoundedImage,
         image2: string | Buffer | BoundedImage,
         opts: GetDiffAreaOptions
     ): Promise<CoordBounds | null>;
 
-    export async function createDiff(options: CreateDiffOptions): Promise<null>;
-    export async function createDiff(options: CreateDiffAsBufferOptions): Promise<Buffer>;
+    export function createDiff(options: CreateDiffOptions): Promise<null>;
+    export function createDiff(options: CreateDiffAsBufferOptions): Promise<Buffer>;
 
     /**
      * Compare two colors
@@ -291,13 +291,13 @@ declare module looksSame {
  * @param image2 The second image
  * @param options The options passed to looksSame function
  */
-async function looksSame(
+declare function looksSame(
     image1: string | Buffer | looksSame.BoundedImage,
     image2: string | Buffer | looksSame.BoundedImage,
     options?: looksSame.LooksSameOptions & { createDiffImage?: false },
 ): Promise<looksSame.LooksSameResult<false>>;
 
-async function looksSame(
+declare function looksSame(
     image1: string | Buffer | looksSame.BoundedImage,
     image2: string | Buffer | looksSame.BoundedImage,
     options: looksSame.LooksSameOptions & { createDiffImage: true },