diff --git a/message.go b/message.go
index 629bdbd..56c2a96 100644
--- a/message.go
+++ b/message.go
@@ -246,15 +246,16 @@ func (c *Client) GetMessageMetadataPage(ctx context.Context, page, pageSize int,
 
 		Page     int
 		PageSize int
-
-		Sort string
 	}{
 		MessageFilter: filter,
 
 		Page:     page,
 		PageSize: pageSize,
+	}
 
-		Sort: "ID",
+	/* keep default sort to maintain backward compatibility */
+	if req.Sort == "" {
+		req.Sort = "ID"
 	}
 
 	for {
diff --git a/message_types.go b/message_types.go
index 4d5fe95..a6ef6d9 100644
--- a/message_types.go
+++ b/message_types.go
@@ -55,6 +55,7 @@ type MessageFilter struct {
 	ExternalID string `json:",omitempty"`
 	LabelID    string `json:",omitempty"`
 	EndID      string `json:",omitempty"`
+	Sort       string `json:",omitempty"`
 	Desc       Bool
 }