diff --git a/actionpack/CHANGELOG b/actionpack/CHANGELOG
index 01f3f700c9..63510e7bc2 100644
--- a/actionpack/CHANGELOG
+++ b/actionpack/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Fixed Form.disable in Prototype #1317 [Wintermute]
+
 * Added accessors to logger, params, response, session, and headers from the view, so you can write <% logger.info "stuff" %> instead of <% @logger.info "others" %> -- more consistent with the preferred way of accessing these attributes and collections from the controller
 
 * Added support for POST data in form of YAML or XML, which is controller through the X-POST_DATA_MARSHAL header. Example request:
diff --git a/actionpack/lib/action_view/helpers/javascripts/prototype.js b/actionpack/lib/action_view/helpers/javascripts/prototype.js
index 72b141ac4a..b7647f2714 100644
--- a/actionpack/lib/action_view/helpers/javascripts/prototype.js
+++ b/actionpack/lib/action_view/helpers/javascripts/prototype.js
@@ -312,7 +312,7 @@ var Form = {
     for (var i = 0; i < elements.length; i++) {
       var element = elements[i];
       element.blur();
-      element.disable = 'true';
+      element.disabled = 'true';
     }
   },
 
diff --git a/railties/html/javascripts/prototype.js b/railties/html/javascripts/prototype.js
index 72b141ac4a..b7647f2714 100644
--- a/railties/html/javascripts/prototype.js
+++ b/railties/html/javascripts/prototype.js
@@ -312,7 +312,7 @@ var Form = {
     for (var i = 0; i < elements.length; i++) {
       var element = elements[i];
       element.blur();
-      element.disable = 'true';
+      element.disabled = 'true';
     }
   },