diff --git a/app/assets/javascripts/tag_script.js b/app/assets/javascripts/tag_script.js
index 7dade90fe..2f753b3b1 100644
--- a/app/assets/javascripts/tag_script.js
+++ b/app/assets/javascripts/tag_script.js
@@ -34,7 +34,7 @@
       }
     } else if (command === "[reset]") {
       return [];
-    } else if (command[0] === "-" && !command.match(/^-pool:/i)) {
+    } else if (command[0] === "-" && !command.match(/^(?:-pool|-parent):/i)) {
       return Danbooru.reject(tags, function(x) {return x === command.substr(1, 100)});
     } else {
       tags.push(command);
diff --git a/app/models/post.rb b/app/models/post.rb
index 6ae650f5f..ee8b93286 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -432,7 +432,7 @@ class Post < ActiveRecord::Base
     end
 
     def filter_metatags(tags)
-      @pre_metatags, tags = tags.partition {|x| x =~ /\A(?:rating|parent):/i}
+      @pre_metatags, tags = tags.partition {|x| x =~ /\A(?:rating|parent|-parent):/i}
       @post_metatags, tags = tags.partition {|x| x =~ /\A(?:-pool|pool|newpool|fav|child):/i}
       apply_pre_metatags
       return tags
@@ -485,6 +485,11 @@ class Post < ActiveRecord::Base
         when /^parent:none$/i, /^parent:0$/i
           self.parent_id = nil
 
+        when /^-parent:(\d+)$/i
+          if parent_id == $1.to_i
+            self.parent_id = nil
+          end
+
         when /^parent:(\d+)$/i
           if $1.to_i != id && Post.exists?(["id = ?", $1.to_i])
             self.parent_id = $1.to_i