diff --git a/app/models/post.rb b/app/models/post.rb
index 2cf8b86a8..4ef05b151 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -639,6 +639,7 @@ class Post < ActiveRecord::Base
       return tags if !Danbooru.config.enable_dimension_autotagging
 
       tags -= %w(incredibly_absurdres absurdres highres lowres huge_filesize flash webm mp4)
+      tags -= %w(animated_gif animated_png) if new_record?
 
       if has_dimensions?
         if image_width >= 10_000 || image_height >= 10_000