diff --git a/omaha/protocol.go b/omaha/protocol.go
index 8a2d411..ed5e092 100644
--- a/omaha/protocol.go
+++ b/omaha/protocol.go
@@ -142,7 +142,7 @@ type PingRequest struct {
 type EventRequest struct {
 	Type            EventType   `xml:"eventtype,attr"`
 	Result          EventResult `xml:"eventresult,attr"`
-	ErrorCode       string      `xml:"errorcode,attr,omitempty"`
+	ErrorCode       int         `xml:"errorcode,attr,omitempty"`
 	NextVersion     string      `xml:"nextversion,attr,omitempty"`
 	PreviousVersion string      `xml:"previousversion,attr,omitempty"`
 }