diff --git a/src/invidious/jsonify/api_v1/video_json.cr b/src/invidious/jsonify/api_v1/video_json.cr
index 2d41ed3b..3625b8f1 100644
--- a/src/invidious/jsonify/api_v1/video_json.cr
+++ b/src/invidious/jsonify/api_v1/video_json.cr
@@ -109,7 +109,7 @@ module Invidious::JSONify::APIv1
               # On livestreams, it's not present, so always fall back to the
               # current unix timestamp (up to mS precision) for compatibility.
               last_modified = fmt["lastModified"]?
-              last_modified ||= "#{Time.utc.to_unix_ms.to_s}000"
+              last_modified ||= "#{Time.utc.to_unix_ms}000"
               json.field "lmt", last_modified
 
               json.field "projectionType", fmt["projectionType"]