diff --git a/activitypub/apmodels/message.go b/activitypub/apmodels/message.go
index 67d124982..646057c36 100644
--- a/activitypub/apmodels/message.go
+++ b/activitypub/apmodels/message.go
@@ -20,7 +20,7 @@ func CreateCreateActivity(id string, localAccountIRI *url.URL) vocab.ActivityStr
 }
 
 // AddImageAttachmentToNote will add the provided image URL to the provided note object.
-func AddImageAttachmentToNote(note vocab.ActivityStreamsNote, image string) {
+func AddImageAttachmentToNote(note vocab.ActivityStreamsNote, image, mediaType string) {
 	imageURL, err := url.Parse(image)
 	if err != nil {
 		return
@@ -40,9 +40,13 @@ func AddImageAttachmentToNote(note vocab.ActivityStreamsNote, image string) {
 	imageProp := streams.NewActivityStreamsImageProperty()
 	imageProp.AppendActivityStreamsImage(apImage)
 
-	imageDescription := streams.NewActivityStreamsContentProperty()
+	imageDescription := streams.NewActivityStreamsNameProperty()
 	imageDescription.AppendXMLSchemaString("Live stream preview")
-	apImage.SetActivityStreamsContent(imageDescription)
+	apImage.SetActivityStreamsName(imageDescription)
+
+	mediaTypeProperty := streams.NewActivityStreamsMediaTypeProperty()
+	mediaTypeProperty.Set(mediaType)
+	apImage.SetActivityStreamsMediaType(mediaTypeProperty)
 
 	attachments.AppendActivityStreamsImage(apImage)
 
diff --git a/activitypub/outbox/outbox.go b/activitypub/outbox/outbox.go
index ed2486e57..13a5e11b4 100644
--- a/activitypub/outbox/outbox.go
+++ b/activitypub/outbox/outbox.go
@@ -76,18 +76,21 @@ func SendLive() error {
 	previewURL, err := url.Parse(data.GetServerURL())
 	if err == nil {
 		var imageToAttach string
+		var mediaType string
 		previewGif := filepath.Join(config.WebRoot, "preview.gif")
 		thumbnailJpg := filepath.Join(config.WebRoot, "thumbnail.jpg")
 		uniquenessString := shortid.MustGenerate()
 		if utils.DoesFileExists(previewGif) {
 			imageToAttach = "preview.gif"
+			mediaType = "image/gif"
 		} else if utils.DoesFileExists(thumbnailJpg) {
 			imageToAttach = "thumbnail.jpg"
+			mediaType = "image/jpeg"
 		}
 		if imageToAttach != "" {
 			previewURL.Path = imageToAttach
 			previewURL.RawQuery = "us=" + uniquenessString
-			apmodels.AddImageAttachmentToNote(note, previewURL.String())
+			apmodels.AddImageAttachmentToNote(note, previewURL.String(), mediaType)
 		}
 	}