diff --git a/message.go b/message.go
index ac73d31..56b02a2 100644
--- a/message.go
+++ b/message.go
@@ -109,8 +109,17 @@ func (s *Session) ArchiveMessages(ids []string) error {
 		return fmt.Errorf("ID list was empty")
 	}
 
-	payload := map[string][]string{
-		"messageIds": ids,
+	var newList []int
+	for i := 0; i < len(ids); i++ {
+		idString, err := strconv.Atoi(ids[i])
+		if err != nil {
+			return err
+		}
+		newList = append(newList, idString)
+	}
+
+	payload := map[string][]int{
+		"messageIds": newList,
 	}
 
 	data, err := json.Marshal(&payload)