csrf_token didn't exist in django 1.1

templates/registration/login.html

@@ -15,7 +15,7 @@
 
     <ul>
       <li>Provide username and password:
-        <form action="" method="post">{% csrf_token %}
+        <form action="" method="post">
               <label for="username"></label>
               <input type="text" name="username" value="" id="username">
               <label for="password"></label>