diff --git a/docs/change-log.md b/docs/change-log.md
index 8fb182f8..273cd0b1 100644
--- a/docs/change-log.md
+++ b/docs/change-log.md
@@ -13,6 +13,7 @@
 
 -	fix routing bug in IE9 [#320](https://github.com/lhorie/mithril.js/issues/320)
 -	fix ordering bug in m.trust when using HTML entities [#453](https://github.com/lhorie/mithril.js/issues/453)
+-	set promise's default value to initialValue if coming from m.request [#454](https://github.com/lhorie/mithril.js/issues/454)
 
 ---
 
diff --git a/docs/mithril.request.md b/docs/mithril.request.md
index ad89a482..2b474861 100644
--- a/docs/mithril.request.md
+++ b/docs/mithril.request.md
@@ -433,8 +433,8 @@ where:
 		[Object<any> data,]
 		[Boolean background,]
 		[any initialValue,]
-		[any unwrapSuccess(any data),]
-		[any unwrapError(any data),]
+		[any unwrapSuccess(any data, XMLHttpRequest xhr),]
+		[any unwrapError(any data, XMLHttpRequest xhr),]
 		[String serialize(any dataToSerialize),]
 		[any deserialize(String dataToDeserialize),]
 		[any extract(XMLHttpRequest xhr, XHROptions options),]
diff --git a/docs/tools.md b/docs/tools.md
index 99833267..a0c0ae76 100644
--- a/docs/tools.md
+++ b/docs/tools.md
@@ -57,7 +57,7 @@ You can use it by adding a reference to your Typescript files. This will allow t
 
 ### Internet Explorer Compatibility
 
-Mithril relies on some Ecmascript 5 features, namely: `Array::indexOf`, `Array::map` and `Object::keys`, as well as the `JSON` object.
+Mithril relies on some ECMAScript 5 features, namely: `Array::indexOf`, `Array::map` and `Object::keys`, as well as the `JSON` object. Internet Explorer 8 lacks native support for some of these features.
 
 The easiest way to polyfill these features is to include this script:
 
@@ -79,4 +79,4 @@ You can also use other polyfills to support these features in IE7.
 
 Mithril also has a dependency on XMLHttpRequest. If you wish to support IE6, you'll need [a shim for it](https://gist.github.com/Contra/2709462). IE7 and lower do not support cross-domain AJAX requests.
 
-In addition, note that most `m.route` modes rely on `history.pushState` in order to allow moving from one page to another without a browser refresh. [IE9 and lower](http://caniuse.com/#search=pushstate) do not support this feature and will gracefully degrade to page refreshes instead.
\ No newline at end of file
+In addition, note that most `m.route` modes rely on `history.pushState` in order to allow moving from one page to another without a browser refresh. [IE9 and lower](http://caniuse.com/#search=pushstate) do not support this feature and will gracefully degrade to page refreshes instead.
diff --git a/mithril.js b/mithril.js
index b8b81407..fd9e7b08 100644
--- a/mithril.js
+++ b/mithril.js
@@ -786,7 +786,8 @@ var m = (function app(window, undefined) {
 		var prop = m.prop();
 		promise.then(prop);
 		prop.then = function(resolve, reject) {
-			return propify(promise.then(resolve, reject))
+			promise = promise.then(resolve, reject).then(prop);
+			return prop;
 		};
 		return prop
 	}
diff --git a/tests/mithril-tests.js b/tests/mithril-tests.js
index 2e620c78..2bc85452 100644
--- a/tests/mithril-tests.js
+++ b/tests/mithril-tests.js
@@ -2227,6 +2227,13 @@ function testMithril(mock) {
 		xhr.onreadystatechange()
 		return xhr.$headers["Content-Type"] === undefined
 	})
+	test(function() {
+		var prop = m.request({method: "POST", url: "test", initialValue: "foo"}).then(function(data) { return data; })
+		var initialValue = prop();
+		mock.XMLHttpRequest.$instances.pop().onreadystatechange()
+
+		return initialValue === "foo"
+	})
 	test(function() {
 		var prop = m.request({method: "POST", url: "test", initialValue: "foo"})
 		var initialValue = prop();