diff --git a/mithril.js b/mithril.js
index 9a8be835..b2b59599 100644
--- a/mithril.js
+++ b/mithril.js
@@ -80,7 +80,7 @@ Mithril = m = new function app(window) {
 					}
 				}
 				var actions = Object.keys(existing).map(function(key) {return existing[key]})
-				var changes = actions.sort(function(a, b) {return a.action - b.action || b.index - a.index})
+				var changes = actions.sort(function(a, b) {return a.action - b.action || a.index - b.index})
 				var newCached = cached.slice()
 				
 				for (var i = 0, change; change = changes[i]; i++) {
@@ -90,7 +90,7 @@ Mithril = m = new function app(window) {
 					}
 					if (change.action == INSERTION) {
 						var dummy = window.document.createElement("div")
-						dummy.key = data[change.index].attrs.key.toString()
+						dummy.key = data[change.index].attrs.key
 						parentElement.insertBefore(dummy, parentElement.childNodes[change.index])
 						newCached.splice(change.index, 0, {attrs: {key: data[change.index].attrs.key}, nodes: [dummy]})
 					}
diff --git a/tests/mithril-tests.js b/tests/mithril-tests.js
index 4f6bd6a6..b0d54648 100644
--- a/tests/mithril-tests.js
+++ b/tests/mithril-tests.js
@@ -678,6 +678,13 @@ function testMithril(mock) {
 		]))
 		return root.childNodes[0].childNodes[8].nodeName == "SPAN"
 	})
+	test(function() {
+		//https://github.com/lhorie/mithril.js/issues/157
+		var root = mock.document.createElement("div")
+		m.render(root, m("ul", [m("li", {key: 0}), m("li", {key: 2}), m("li", {key: 4})]))
+		m.render(root, m("ul", [m("li", {key: 0}), m("li", {key: 1}), m("li", {key: 2}), m("li", {key: 3}), m("li", {key: 4}), m("li", {key: 5})]))
+		return root.childNodes[0].childNodes.map(function(n) {return n.key}).join("") == "012345"
+	})
 	//end m.render
 
 	//m.redraw