diff --git a/db/migrate/043_add_updated_at_to_todos.rb b/db/migrate/043_add_updated_at_to_todos.rb
index ec14720a..abf8dc97 100644
--- a/db/migrate/043_add_updated_at_to_todos.rb
+++ b/db/migrate/043_add_updated_at_to_todos.rb
@@ -2,7 +2,7 @@ class AddUpdatedAtToTodos < ActiveRecord::Migration
   def self.up
       add_column :todos, :updated_at, :timestamp
       execute 'update todos set updated_at = created_at where completed_at IS NULL'
-      execute 'update todos set updated_at = completed_at where NOT completed_at IS NULL'
+      execute 'update todos set updated_at = completed_at where NOT (completed_at IS NULL)'
   end
   def self.down
       remove_column :todos, :updated_at