diff --git a/CHANGELOG b/CHANGELOG
index d7f464c..a02620e 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Fix regression in which no-argument calls to Element.addMethods() would not add the methods defined in Form.Methods and Form.Element.Methods.  Closes #8206.  [Tobie Langel, fwittekind]
+
 * Fix Element#readAttribute to work with the 'type' attribute in IE.  Closes #8160.  [Tobie Langel, Wiktor Ihárosi]
 
 *1.5.1_rc3* (April 24, 2007)
diff --git a/src/dom.js b/src/dom.js
index a0fb444..4d5e897 100644
--- a/src/dom.js
+++ b/src/dom.js
@@ -586,6 +586,18 @@ Element.hasAttribute = function(element, attribute) {
 
 Element.addMethods = function(methods) {
   var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
+  
+  if (!methods) {
+    Object.extend(Form, Form.Methods);
+    Object.extend(Form.Element, Form.Element.Methods);
+    Object.extend(Element.Methods.ByTag, {
+      "FORM":     Object.clone(Form.Methods),
+      "INPUT":    Object.clone(Form.Element.Methods),
+      "SELECT":   Object.clone(Form.Element.Methods),
+      "TEXTAREA": Object.clone(Form.Element.Methods)
+    });
+  }
+  
   if (arguments.length == 2) {
     var tagName = methods;
     methods = arguments[1];
diff --git a/src/form.js b/src/form.js
index f60c1d8..1fd5837 100644
--- a/src/form.js
+++ b/src/form.js
@@ -97,8 +97,6 @@ Form.Methods = {
   }
 }
 
-Object.extend(Form, Form.Methods);
-
 /*--------------------------------------------------------------------------*/
 
 Form.Element = {
@@ -167,14 +165,6 @@ Form.Element.Methods = {
   }
 }
 
-Object.extend(Form.Element, Form.Element.Methods);
-Object.extend(Element.Methods.ByTag, {
-  "FORM":     Object.clone(Form.Methods),
-  "INPUT":    Object.clone(Form.Element.Methods),
-  "SELECT":   Object.clone(Form.Element.Methods),
-  "TEXTAREA": Object.clone(Form.Element.Methods)
-});
-
 /*--------------------------------------------------------------------------*/
 
 var Field = Form.Element;
diff --git a/test/unit/element_mixins.html b/test/unit/element_mixins.html
index afb3591..5851792 100644
--- a/test/unit/element_mixins.html
+++ b/test/unit/element_mixins.html
@@ -32,11 +32,19 @@
 <!-- Tests follow -->
 <script type="text/javascript" language="javascript" charset="utf-8">
 // <![CDATA[
+Form.Element.Methods.coffee = Prototype.K;
+Element.addMethods();
+
   new Test.Unit.Runner({
     testInput: function() {with(this) {
       assert($("input").present != null);
       assert(typeof $("input").present == 'function');
       assert($("input").select != null);
+      assertRespondsTo('present', Form.Element);
+      assertRespondsTo('present', Form.Element.Methods);
+      assertRespondsTo('coffee', $('input'));
+      assertIdentical(Prototype.K, Form.Element.coffee);
+      assertIdentical(Prototype.K, Form.Element.Methods.coffee);
     }},
     
     testForm: function() {with(this) {