diff --git a/cmd/bucket-notification-datatypes.go b/cmd/bucket-notification-datatypes.go
index 083dafcad..547e838c5 100644
--- a/cmd/bucket-notification-datatypes.go
+++ b/cmd/bucket-notification-datatypes.go
@@ -137,13 +137,13 @@ type bucketMeta struct {
 
 // Notification event object metadata.
 type objectMeta struct {
-	Key         string            `json:"key"`
-	Size        int64             `json:"size,omitempty"`
-	ETag        string            `json:"eTag,omitempty"`
-	ContentType string            `json:"contentType,omitempty"`
-	UserDefined map[string]string `json:"userDefined,omitempty"`
-	VersionID   string            `json:"versionId,omitempty"`
-	Sequencer   string            `json:"sequencer"`
+	Key          string            `json:"key"`
+	Size         int64             `json:"size,omitempty"`
+	ETag         string            `json:"eTag,omitempty"`
+	ContentType  string            `json:"contentType,omitempty"`
+	UserMetadata map[string]string `json:"userMetadata,omitempty"`
+	VersionID    string            `json:"versionId,omitempty"`
+	Sequencer    string            `json:"sequencer"`
 }
 
 const (
diff --git a/cmd/event-notifier.go b/cmd/event-notifier.go
index 0bf9d57ce..274d437d6 100644
--- a/cmd/event-notifier.go
+++ b/cmd/event-notifier.go
@@ -167,13 +167,13 @@ func newNotificationEvent(event eventData) NotificationEvent {
 
 	// For all other events we should set ETag and Size.
 	nEvent.S3.Object = objectMeta{
-		Key:         escapedObj,
-		ETag:        event.ObjInfo.ETag,
-		Size:        event.ObjInfo.Size,
-		ContentType: event.ObjInfo.ContentType,
-		UserDefined: event.ObjInfo.UserDefined,
-		VersionID:   "1",
-		Sequencer:   uniqueID,
+		Key:          escapedObj,
+		ETag:         event.ObjInfo.ETag,
+		Size:         event.ObjInfo.Size,
+		ContentType:  event.ObjInfo.ContentType,
+		UserMetadata: event.ObjInfo.UserDefined,
+		VersionID:    "1",
+		Sequencer:    uniqueID,
 	}
 
 	// Success.