diff --git a/db/migrate/20100313171051_add_index_on_issues_nested_set.rb b/db/migrate/20100313171051_add_index_on_issues_nested_set.rb
new file mode 100644
index 000000000..4dc948000
--- /dev/null
+++ b/db/migrate/20100313171051_add_index_on_issues_nested_set.rb
@@ -0,0 +1,9 @@
+class AddIndexOnIssuesNestedSet < ActiveRecord::Migration
+  def self.up
+    add_index :issues, [:root_id, :lft, :rgt]
+  end
+
+  def self.down
+    remove_index :issues, [:root_id, :lft, :rgt]
+  end
+end