diff --git a/apps/threads.lua b/apps/threads.lua
index 1932594..b83b914 100644
--- a/apps/threads.lua
+++ b/apps/threads.lua
@@ -147,7 +147,7 @@ app:post("thread", "/:slug", function(self)
   
   local subscription = Subscriptions:find({user_id = user.id, thread_id = thread.id})
   if subscription then
-    subscription:update({last_seen = os.time})
+    subscription:update({last_seen = os.time()})
   end
   if self.params.subscribe == "on" and not subscription then
     Subscriptions:create({user_id = user.id, thread_id = thread.id, last_seen = os.time()})