diff --git a/app/serializers/rest/v1/instance_serializer.rb b/app/serializers/rest/v1/instance_serializer.rb
index e0ba1812e4..91437cfba9 100644
--- a/app/serializers/rest/v1/instance_serializer.rb
+++ b/app/serializers/rest/v1/instance_serializer.rb
@@ -83,7 +83,6 @@ class REST::V1::InstanceSerializer < ActiveModel::Serializer
       },
 
       media_attachments: {
-        supported_mime_types: MediaAttachment::IMAGE_MIME_TYPES + MediaAttachment::VIDEO_MIME_TYPES + MediaAttachment::AUDIO_MIME_TYPES,
         max_characters: MediaAttachment::MAX_DESCRIPTION_LENGTH,
         supported_mime_types: MediaAttachment.supported_mime_types,
         image_size_limit: MediaAttachment::IMAGE_LIMIT,