diff --git a/src/WAClient/Base.ts b/src/WAClient/Base.ts
index 2db5269..bc63fdf 100644
--- a/src/WAClient/Base.ts
+++ b/src/WAClient/Base.ts
@@ -18,14 +18,13 @@ export default class WhatsAppWebBase extends WAConnection {
             if (json.cmd === 'ack') {
                 ids = [json.id]
             }
-            const ackTypes = [MessageStatus.sent, MessageStatus.received, MessageStatus.read]
             const data: MessageStatusUpdate = {
                 from: json.from,
                 to: json.to,
                 participant: json.participant,
                 timestamp: new Date(json.t * 1000),
                 ids: ids,
-                type: ackTypes[json.ack - 1] || 'unknown (' + json.ack + ')',
+                type: json.ack,
             }
             callback(data)
         }
diff --git a/src/WAClient/Constants.ts b/src/WAClient/Constants.ts
index 672aa6b..0c02819 100644
--- a/src/WAClient/Constants.ts
+++ b/src/WAClient/Constants.ts
@@ -100,7 +100,7 @@ export interface MessageStatusUpdate {
     /** Message IDs read/delivered */
     ids: string[]
     /** Status of the Message IDs */
-    type: string
+    type: proto.WebMessageInfo.WEB_MESSAGE_INFO_STATUS
 }
 export interface PresenceUpdate {
     id: string