diff --git a/4chan_x.user.js b/4chan_x.user.js
index ff8f74507..3419b9f5a 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -4070,7 +4070,6 @@
           });
         }
       }
-      Main.hasCodeTags = !!$('script[src="//static.4chan.org/js/prettify/prettify.js"]');
       board = $('.board');
       nodes = [];
       _ref1 = $$('.postContainer', board);
@@ -4079,6 +4078,7 @@
         nodes.push(Main.preParse(node));
       }
       Main.node(nodes, true);
+      Main.hasCodeTags = !!$('script[src="//static.4chan.org/js/prettify/prettify.js"]');
       if (MutationObserver = window.WebKitMutationObserver || window.MozMutationObserver || window.OMutationObserver || window.MutationObserver) {
         observer = new MutationObserver(Main.observer);
         return observer.observe(board, {
diff --git a/script.coffee b/script.coffee
index 3e7e135c0..45ba65eb2 100644
--- a/script.coffee
+++ b/script.coffee
@@ -3099,14 +3099,15 @@ Main =
       if Conf['Index Navigation']
         setTimeout -> Nav.init()
 
-    Main.hasCodeTags = !! $ 'script[src="//static.4chan.org/js/prettify/prettify.js"]'
-
     board = $ '.board'
     nodes = []
     for node in $$ '.postContainer', board
       nodes.push Main.preParse node
     Main.node nodes, true
 
+    # Execute these scripts on inserted posts, not page init.
+    Main.hasCodeTags = !! $ 'script[src="//static.4chan.org/js/prettify/prettify.js"]'
+
     if MutationObserver = window.WebKitMutationObserver or window.MozMutationObserver or window.OMutationObserver or window.MutationObserver
       observer = new MutationObserver Main.observer
       observer.observe board,