diff --git a/structure.go b/structure.go
index 004412f..312d62b 100644
--- a/structure.go
+++ b/structure.go
@@ -80,7 +80,7 @@ type Response struct {
 
 	// These common fields are persistent across all requests.
 	Version            string `xml:"Version"`
-	DeviceId           string `xml:"DeviceId"`
+	DeviceId           int `xml:"DeviceId"`
 	MessageId          string `xml:"MessageId"`
 	TimeStamp          string `xml:"TimeStamp"`
 	ErrorCode          int