diff --git a/fixtures/update-engine/update/request.xml b/fixtures/update-engine/update/request.xml
index f413143..c79be35 100644
--- a/fixtures/update-engine/update/request.xml
+++ b/fixtures/update-engine/update/request.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <request protocol="3.0" version="ChromeOSUpdateEngine-0.1.0.0" updaterversion="ChromeOSUpdateEngine-0.1.0.0" installsource="ondemandupdate" ismachine="1">
 <os version="Indy" platform="Chrome OS" sp="ForcedUpdate_x86_64"></os>
-<app appid="{87efface-864d-49a5-9bb3-4b050a7c227a}" bootid="{7D52A1CC-7066-40F0-91C7-7CB6A871BFDE}" previousbootid="{8BDE4C4D-9083-4D61-B41C-3253212C0C37}" oem="ec3000" version="ForcedUpdate" track="dev-channel" from_track="developer-build" lang="en-US" board="amd64-generic" hardware_class="" delta_okay="false" >
+<app appid="{87efface-864d-49a5-9bb3-4b050a7c227a}" bootid="{7D52A1CC-7066-40F0-91C7-7CB6A871BFDE}" machineid="{8BDE4C4D-9083-4D61-B41C-3253212C0C37}" oem="ec3000" version="ForcedUpdate" track="dev-channel" from_track="developer-build" lang="en-US" board="amd64-generic" hardware_class="" delta_okay="false" >
 <ping active="1" a="-1" r="-1"></ping>
 <updatecheck targetversionprefix=""></updatecheck>
 <event eventtype="3" eventresult="2" previousversion=""></event>
diff --git a/omaha/omaha.go b/omaha/omaha.go
index 492398c..1aa2a97 100644
--- a/omaha/omaha.go
+++ b/omaha/omaha.go
@@ -84,9 +84,9 @@ type App struct {
 	FromTrack string `xml:"from_track,attr,omitempty"`
 
 	// coreos update engine extensions
-	BootId         string `xml:"bootid,attr,omitempty"`
-	PreviousBootId string `xml:"previousbootid,attr,omitempty"`
-	OEM            string `xml:"oem,attr,omitempty"`
+	BootId    string `xml:"bootid,attr,omitempty"`
+	MachineID string `xml:"machineid,attr,omitempty"`
+	OEM       string `xml:"oem,attr,omitempty"`
 }
 
 func NewApp(id string) *App {
diff --git a/omaha/omaha_test.go b/omaha/omaha_test.go
index 9eb792d..5a3eae4 100644
--- a/omaha/omaha_test.go
+++ b/omaha/omaha_test.go
@@ -32,8 +32,8 @@ func TestOmahaRequestUpdateCheck(t *testing.T) {
 		t.Error("Expected a Boot Id")
 	}
 
-	if v.Apps[0].PreviousBootId != "{8BDE4C4D-9083-4D61-B41C-3253212C0C37}" {
-		t.Error("Expected a Previous Boot Id")
+	if v.Apps[0].MachineID != "{8BDE4C4D-9083-4D61-B41C-3253212C0C37}" {
+		t.Error("Expected a MachineId")
 	}
 
 	if v.Apps[0].OEM != "ec3000" {