diff --git a/src/invidious/playlists.cr b/src/invidious/playlists.cr
index 443d19d7..e25180c1 100644
--- a/src/invidious/playlists.cr
+++ b/src/invidious/playlists.cr
@@ -57,7 +57,7 @@ struct PlaylistVideo
     end
   end
 
-  def to_json(locale, json : JSON::Builder, index : Int32?)
+  def to_json(json : JSON::Builder, index : Int32? = nil)
     json.object do
       json.field "title", self.title
       json.field "videoId", self.id
@@ -81,14 +81,8 @@ struct PlaylistVideo
     end
   end
 
-  def to_json(locale, json : JSON::Builder? = nil, index : Int32? = nil)
-    if json
-      to_json(locale, json, index: index)
-    else
-      JSON.build do |json|
-        to_json(locale, json, index: index)
-      end
-    end
+  def to_json(_json : Nil, index : Int32? = nil)
+    JSON.build { |json| to_json(json, index: index) }
   end
 end
 
@@ -144,7 +138,7 @@ struct Playlist
         json.array do
           videos = get_playlist_videos(PG_DB, self, offset: offset, locale: locale, video_id: video_id)
           videos.each do |video|
-            video.to_json(locale, json)
+            video.to_json(json)
           end
         end
       end
@@ -224,7 +218,7 @@ struct InvidiousPlaylist
 
           videos = get_playlist_videos(PG_DB, self, offset: offset, locale: locale, video_id: video_id)
           videos.each_with_index do |video, index|
-            video.to_json(locale, json, offset + index)
+            video.to_json(json, offset + index)
           end
         end
       end
diff --git a/src/invidious/routes/api/v1/authenticated.cr b/src/invidious/routes/api/v1/authenticated.cr
index 7950b302..cdd9e2f6 100644
--- a/src/invidious/routes/api/v1/authenticated.cr
+++ b/src/invidious/routes/api/v1/authenticated.cr
@@ -274,7 +274,10 @@ module Invidious::Routes::API::V1::Authenticated
 
     env.response.headers["Location"] = "#{HOST_URL}/api/v1/auth/playlists/#{plid}/videos/#{playlist_video.index.to_u64.to_s(16).upcase}"
     env.response.status_code = 201
-    playlist_video.to_json(locale, index: playlist.index.size)
+
+    JSON.build do |json|
+      playlist_video.to_json(json, index: playlist.index.size)
+    end
   end
 
   def self.delete_video_in_playlist(env)