diff --git a/mithril.js b/mithril.js
index 5e8e7a44..44e57de1 100644
--- a/mithril.js
+++ b/mithril.js
@@ -743,7 +743,8 @@ 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 a6c161ed..29416db3 100644
--- a/tests/mithril-tests.js
+++ b/tests/mithril-tests.js
@@ -1836,6 +1836,13 @@ 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();