diff --git a/js/models/messages.js b/js/models/messages.js
index 5851cef6b..032428d21 100644
--- a/js/models/messages.js
+++ b/js/models/messages.js
@@ -33,9 +33,6 @@
       this.on('change:expireTimer', this.setToExpire);
       this.on('unload', this.unload);
       this.setToExpire();
-
-      this.VOICE_FLAG =
-        textsecure.protobuf.AttachmentPointer.Flags.VOICE_MESSAGE;
     },
     idForLogging() {
       return `${this.get('source')}.${this.get('sourceDevice')} ${this.get(
@@ -248,8 +245,7 @@
           });
 
       return Object.assign({}, attachment, {
-        // eslint-disable-next-line no-bitwise
-        isVoiceMessage: Boolean(attachment.flags & this.VOICE_FLAG),
+        isVoiceMessage: Signal.Types.Attachment.isVoiceMessage(attachment),
         thumbnail: thumbnailWithObjectUrl,
       });
     },
diff --git a/ts/components/conversation/Message.md b/ts/components/conversation/Message.md
index afefcd507..1b01c3cba 100644
--- a/ts/components/conversation/Message.md
+++ b/ts/components/conversation/Message.md
@@ -597,7 +597,7 @@ const outgoing = new Whisper.Message({
   sent_at: Date.now() - 15000,
   attachments: [
     {
-      flags: textsecure.protobuf.AttachmentPointer.Flags.VOICE_MESSAGE,
+      flags: SignalService.AttachmentPointer.Flags.VOICE_MESSAGE,
       data: util.mp3,
       fileName: 'agnus_dei.mp3',
       contentType: 'audio/mp3',
diff --git a/ts/components/conversation/Quote.md b/ts/components/conversation/Quote.md
index 7cdf0b514..5ab2f5896 100644
--- a/ts/components/conversation/Quote.md
+++ b/ts/components/conversation/Quote.md
@@ -572,7 +572,7 @@ const outgoing = new Whisper.Message({
     attachments: [
       {
         // proposed as of afternoon of 4/6 in Quoted Replies group
-        flags: textsecure.protobuf.AttachmentPointer.Flags.VOICE_MESSAGE,
+        flags: SignalService.AttachmentPointer.Flags.VOICE_MESSAGE,
         contentType: 'audio/mp3',
         fileName: 'agnus_dei.mp4',
       },