diff --git a/readme.md b/readme.md
index c97c4d422..856689986 100644
--- a/readme.md
+++ b/readme.md
@@ -236,7 +236,9 @@ Type: `string | Buffer | stream.Readable` or [`form-data` instance](https://gith
 
 **Note #4:** This option is not enumerable and will not be merged with the instance defaults.
 
-The `content-length` header will be automatically set if `body` is a `string` / `Buffer` / `fs.createReadStream` instance / [`form-data` instance](https://github.com/form-data/form-data), and `content-length` and `transfer-encoding` are not manually set in `options.headers`.
+The `content-length` header will be automatically set if `body` is a `string` / `Buffer` / [`form-data` instance](https://github.com/form-data/form-data), and `content-length` and `transfer-encoding` are not manually set in `options.headers`.
+
+Since Got 12, the `content-length` is not automatically set when `body` is a `fs.createReadStream`.
 
 ###### json
 
diff --git a/source/core/index.ts b/source/core/index.ts
index ae1015fa6..3557daec8 100644
--- a/source/core/index.ts
+++ b/source/core/index.ts
@@ -423,7 +423,9 @@ interface PlainOptions extends URLOptions {
 
 	__Note #4__: This option is not enumerable and will not be merged with the instance defaults.
 
-	The `content-length` header will be automatically set if `body` is a `string` / `Buffer` / `fs.createReadStream` instance / [`form-data` instance](https://github.com/form-data/form-data), and `content-length` and `transfer-encoding` are not manually set in `options.headers`.
+	The `content-length` header will be automatically set if `body` is a `string` / `Buffer` / [`form-data` instance](https://github.com/form-data/form-data), and `content-length` and `transfer-encoding` are not manually set in `options.headers`.
+
+	Since Got 12, the `content-length` is not automatically set when `body` is a `fs.createReadStream`.
 	*/
 	body?: string | Buffer | Readable;
 
diff --git a/source/core/utils/get-body-size.ts b/source/core/utils/get-body-size.ts
index d7cf8f0c6..88453daa6 100644
--- a/source/core/utils/get-body-size.ts
+++ b/source/core/utils/get-body-size.ts
@@ -1,11 +1,8 @@
-import {ReadStream, stat} from 'fs';
 import {promisify} from 'util';
 import {ClientRequestArgs} from 'http';
 import is from '@sindresorhus/is';
 import isFormData from './is-form-data';
 
-const statAsync = promisify(stat);
-
 export default async (body: unknown, headers: ClientRequestArgs['headers']): Promise<number | undefined> => {
 	if (headers && 'content-length' in headers) {
 		return Number(headers['content-length']);
@@ -27,15 +24,5 @@ export default async (body: unknown, headers: ClientRequestArgs['headers']): Pro
 		return promisify(body.getLength.bind(body))();
 	}
 
-	if (body instanceof ReadStream) {
-		const {size} = await statAsync(body.path);
-
-		if (size === 0) {
-			return undefined;
-		}
-
-		return size;
-	}
-
 	return undefined;
 };
diff --git a/test/headers.ts b/test/headers.ts
index 20107a6fa..e7830de45 100644
--- a/test/headers.ts
+++ b/test/headers.ts
@@ -1,5 +1,4 @@
 import fs = require('fs');
-import {promisify} from 'util';
 import path = require('path');
 import test from 'ava';
 import {Handler} from 'express';
@@ -174,16 +173,15 @@ test('form-data sets `content-length` header', withServer, async (t, server, got
 	t.is(headers['content-length'], '157');
 });
 
-test('stream as `options.body` sets `content-length` header', withServer, async (t, server, got) => {
+test('stream as `options.body` does not set `content-length` header', withServer, async (t, server, got) => {
 	server.post('/', echoHeaders);
 
 	const fixture = path.resolve('test/fixtures/stream-content-length');
-	const {size} = await promisify(fs.stat)(fixture);
 	const {body} = await got.post({
 		body: fs.createReadStream(fixture)
 	});
 	const headers = JSON.parse(body);
-	t.is(Number(headers['content-length']), size);
+	t.is(headers['content-length'], undefined);
 });
 
 test('buffer as `options.body` sets `content-length` header', withServer, async (t, server, got) => {
diff --git a/test/progress.ts b/test/progress.ts
index 39b3bb954..67f5fa9bf 100644
--- a/test/progress.ts
+++ b/test/progress.ts
@@ -122,9 +122,16 @@ test('upload progress - file stream', withServer, async (t, server, got) => {
 	const path = tempy.file();
 	fs.writeFileSync(path, file);
 
+	const {size} = await promisify(fs.stat)(path);
+
 	const events: Progress[] = [];
 
-	await got.post({body: fs.createReadStream(path)})
+	await got.post({
+		body: fs.createReadStream(path),
+		headers: {
+			'content-length': size.toString()
+		}
+	})
 		.on('uploadProgress', (event: Progress) => events.push(event));
 
 	checkEvents(t, events, file.length);