diff --git a/apps/threads.lua b/apps/threads.lua
index 417f8ad..343011b 100644
--- a/apps/threads.lua
+++ b/apps/threads.lua
@@ -69,6 +69,11 @@ app:get("thread", "/:slug", function(self)
   end
   self.thread = thread
 
+  local post_count = Posts:count(db.clause({
+    thread_id = thread.id
+  }))
+  self.pages = math.ceil(post_count / POSTS_PER_PAGE)
+
   if self.params.after then
     local after_id = tonumber(self.params.after)
     local post_position = Posts:count(db.clause({
@@ -77,13 +82,9 @@ app:get("thread", "/:slug", function(self)
     }))
     self.page = math.floor((post_position - 1) / POSTS_PER_PAGE) + 1
   else
-    self.page = tonumber(self.params.page) or 1
+    self.page = math.max(1, math.min(tonumber(self.params.page) or 1, self.pages))
   end
 
-  local post_count = Posts:count(db.clause({
-    thread_id = thread.id
-  }))
-  self.pages = math.ceil(post_count / POSTS_PER_PAGE)
   -- self.page = math.max(1, math.min(self.page, self.pages))
   local posts = db.query([[
     SELECT