diff --git a/types/wkhtmltopdf/index.d.ts b/types/wkhtmltopdf/index.d.ts
index a8f9064c0472f7..077774d0d7cb68 100644
--- a/types/wkhtmltopdf/index.d.ts
+++ b/types/wkhtmltopdf/index.d.ts
@@ -3,6 +3,8 @@
 
 /// <reference types="node"/>
 
+import { Readable } from "stream";
+
 /**
  * Call wkhtmltopdf and write PDF
  * If options.output is defined the file will be returned in the stream
@@ -13,8 +15,8 @@
 declare function wkhtmltopdf(
     html: string,
     options?: Options,
-    callback?: (err: Error, stream: NodeJS.ReadWriteStream) => void,
-): NodeJS.ReadWriteStream;
+    callback?: (err: Error | null, stream?: NodeJS.ReadWriteStream) => void,
+): Readable;
 /**
  * Call wkhtmltopdf and write PDF
  * If options.output is defined the file will be returned in the stream
@@ -26,8 +28,8 @@ declare function wkhtmltopdf(
 declare function wkhtmltopdf(
     url: string,
     options?: Options,
-    callback?: (err: Error, stream: NodeJS.ReadWriteStream) => void,
-): NodeJS.ReadWriteStream;
+    callback?: (err: Error | null, stream?: NodeJS.ReadWriteStream) => void,
+): Readable;
 /**
  * Call wkhtmltopdf and write PDF
  * If options.output is defined the file will be returned in the stream
@@ -36,7 +38,11 @@ declare function wkhtmltopdf(
  * @param [options] Options
  * @param [callback] Callback
  */
-declare function wkhtmltopdf(inputStream: NodeJS.ReadStream, options?: Options): NodeJS.ReadWriteStream;
+declare function wkhtmltopdf(
+    inputStream: NodeJS.ReadStream,
+    options?: Options,
+    callback?: (err: Error | null, stream?: NodeJS.ReadWriteStream) => void,
+): Readable;
 
 declare namespace wkhtmltopdf {
     /**
diff --git a/types/wkhtmltopdf/wkhtmltopdf-tests.ts b/types/wkhtmltopdf/wkhtmltopdf-tests.ts
index e4b4d8680f298a..41fbc760d29162 100644
--- a/types/wkhtmltopdf/wkhtmltopdf-tests.ts
+++ b/types/wkhtmltopdf/wkhtmltopdf-tests.ts
@@ -1,19 +1,24 @@
 import wkhtmltopdf = require("wkhtmltopdf");
 
 // URL
-wkhtmltopdf("http://google.com/", { pageSize: "Letter" }); // $ExpectType NodeJS.ReadWriteStream
+// $ExpectType Readable
+wkhtmltopdf("http://google.com/", { pageSize: "Letter" });
 
 // HTML
-wkhtmltopdf("<h1>Test</h1><p>Hello world</p>"); // $ExpectType ReadWriteStream
+// $ExpectType Readable
+wkhtmltopdf("<h1>Test</h1><p>Hello world</p>");
 
 // output to a file directly
-wkhtmltopdf("http://apple.com/", { output: "out.pdf" }); // $ExpectType ReadWriteStream
+// $ExpectType Readable
+wkhtmltopdf("http://apple.com/", { output: "out.pdf" });
 
 // Optional callback
-wkhtmltopdf("http://google.com/", { pageSize: "Letter" }, (err: Error, stream: NodeJS.ReadWriteStream) => {}); // $ExpectType void
+// $ExpectType Readable
+wkhtmltopdf("http://google.com/", { pageSize: "Letter" }, (err: Error | null, stream?: NodeJS.ReadWriteStream) => {});
 
 // Repeatable options
-wkhtmltopdf("http://google.com/", { // $ExpectType NodeJS.ReadWriteStream
+// $ExpectType Readable
+wkhtmltopdf("http://google.com/", {
     allow: ["path1", "path2"],
     customHeader: [
         ["name1", "value1"],
@@ -22,23 +27,27 @@ wkhtmltopdf("http://google.com/", { // $ExpectType NodeJS.ReadWriteStream
 });
 
 // Ignore warning strings
-wkhtmltopdf("http://apple.com/", { // $ExpectType ReadWriteStream
+// $ExpectType Readable
+wkhtmltopdf("http://apple.com/", {
     output: "out.pdf",
     ignore: ["QFont::setPixelSize: Pixel size <= 0 (0)"],
 });
 
 // RegExp also acceptable
-wkhtmltopdf("http://apple.com/", { // $ExpectType ReadWriteStream
+// $ExpectType Readable
+wkhtmltopdf("http://apple.com/", {
     output: "out.pdf",
     ignore: [/QFont::setPixelSize/],
 });
 
 // Test debug types
-wkhtmltopdf("http://apple.com/", { // $ExpectType ReadWriteStream
+// $ExpectType Readable
+wkhtmltopdf("http://apple.com/", {
     debug: true,
 });
 
-wkhtmltopdf("http://apple.com/", { // $ExpectType ReadWriteStream
+// $ExpectType Readable
+wkhtmltopdf("http://apple.com/", {
     output: "test.pdf",
     debug: (data: Buffer) => {
         const dataString = data.toString();
@@ -56,7 +65,8 @@ wkhtmltopdf.shell; // $ExpectType string
 wkhtmltopdf.command; // $ExpectType string
 
 // Footer and header spacing type
-wkhtmltopdf("http://apple.com/", { // $ExpectType ReadWriteStream
+// $ExpectType Readable
+wkhtmltopdf("http://apple.com/", {
     headerSpacing: 0,
     footerSpacing: 0,
 });