diff --git a/CHANGELOG b/CHANGELOG
index 5215f29..ffc83c3 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,5 @@
+* deprecation extension: mark Hash.toJSON() as removed. [Tobie Langel]
+
 * deprecation extension: mark Class.create() used without arguments as deprecated. [Tobie Langel]
 
 * deprecation extension: mark Event.unloadCache as removed rather than deprecated. [Tobie Langel]
diff --git a/ext/deprecation/deprecation.js b/ext/deprecation/deprecation.js
index 551962c..2db80e1 100644
--- a/ext/deprecation/deprecation.js
+++ b/ext/deprecation/deprecation.js
@@ -276,6 +276,14 @@ DeprecationNotifier.init([
       'Use the instance method Hash#toQueryString or Object.toQueryString instead.'
   },
   
+  {
+    methodName: 'toJSON',
+    namespace: Hash,
+    message: 'Hash.toJSON has been removed.\n' + 
+      'Use the instance method Hash#toJSON or Object.toJSON instead.',
+    type: 'removal'
+  },
+  
   {
     methodName: 'remove',
     namespace: Hash.prototype,
diff --git a/ext/deprecation/deprecation_test.html b/ext/deprecation/deprecation_test.html
index 1079dd9..470573a 100644
--- a/ext/deprecation/deprecation_test.html
+++ b/ext/deprecation/deprecation_test.html
@@ -219,6 +219,10 @@
       Hash.toQueryString({});
       assertDeprecationNotified('Hash.toQueryString has been deprecated.\n' + 
         'Use the instance method Hash#toQueryString or Object.toQueryString instead.');
+
+     Hash.toJSON({});
+      assertRemovalNotified('Hash.toJSON has been removed.\n' + 
+        'Use the instance method Hash#toJSON or Object.toJSON instead.');
       
       var h = $H({ foo: 2 });