diff --git a/README.md b/README.md
index 4638fa31..0e5959d8 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ mithril.js [![NPM Version](https://img.shields.io/npm/v/mithril.svg)](https://ww
 
 ## What is Mithril?
 
-A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.22 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
+A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.25 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
 
 Mithril is used by companies like Vimeo and Nike, and open source platforms like Lichess 👍.
 
diff --git a/mithril.js b/mithril.js
index 77e3c6d9..f6bd38af 100644
--- a/mithril.js
+++ b/mithril.js
@@ -274,10 +274,10 @@ var _8 = function($window, Promise) {
 				_abort.call(xhr)
 			}
 			xhr.open(args.method, args.url, typeof args.async === "boolean" ? args.async : true, typeof args.user === "string" ? args.user : undefined, typeof args.password === "string" ? args.password : undefined)
-			if (args.serialize === JSON.stringify && useBody) {
+			if (args.serialize === JSON.stringify && useBody && !(args.headers && args.headers.hasOwnProperty("Content-Type"))) {
 				xhr.setRequestHeader("Content-Type", "application/json; charset=utf-8")
 			}
-			if (args.deserialize === deserialize) {
+			if (args.deserialize === deserialize && !(args.headers && args.headers.hasOwnProperty("Accept"))) {
 				xhr.setRequestHeader("Accept", "application/json, text/*")
 			}
 			if (args.withCredentials) xhr.withCredentials = args.withCredentials
diff --git a/mithril.min.js b/mithril.min.js
index c68ee276..edc24225 100644
--- a/mithril.min.js
+++ b/mithril.min.js
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