diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index 25667af101..2d934f8bc4 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Calling ActiveSupport::JSON.decode with unsupported options now raises an error.
+
+    *Godfrey Chan*
+
 *   Support :unless_exist in FileStore
 
     *Michael Grosser*
diff --git a/activesupport/lib/active_support/json/decoding.rb b/activesupport/lib/active_support/json/decoding.rb
index 21de09c1cc..315c76199a 100644
--- a/activesupport/lib/active_support/json/decoding.rb
+++ b/activesupport/lib/active_support/json/decoding.rb
@@ -14,7 +14,14 @@ module ActiveSupport
       #   ActiveSupport::JSON.decode("{\"team\":\"rails\",\"players\":\"36\"}")
       #   => {"team" => "rails", "players" => "36"}
       def decode(json, options = {})
-        data = ::JSON.parse(json, options.merge(create_additions: false, quirks_mode: true))
+        if options.present?
+          raise ArgumentError, "In Rails 4.1, ActiveSupport::JSON.decode no longer " \
+            "accepts an options hash for MultiJSON. MultiJSON reached its end of life " \
+            "and has been removed."
+        end
+
+        data = ::JSON.parse(json, quirks_mode: true)
+
         if ActiveSupport.parse_json_times
           convert_dates_from(data)
         else
diff --git a/activesupport/test/json/decoding_test.rb b/activesupport/test/json/decoding_test.rb
index e9780b36e4..07d7e530ca 100644
--- a/activesupport/test/json/decoding_test.rb
+++ b/activesupport/test/json/decoding_test.rb
@@ -98,10 +98,8 @@ class TestJSONDecoding < ActiveSupport::TestCase
     assert_raise(ActiveSupport::JSON.parse_error) { ActiveSupport::JSON.decode(%()) }
   end
 
-  def test_cannot_force_json_unmarshalling
-    encodeded = %q({"json_class":"TestJSONDecoding::Foo"})
-    decodeded = {"json_class"=>"TestJSONDecoding::Foo"}
-    assert_equal decodeded, ActiveSupport::JSON.decode(encodeded, create_additions: true)
+  def test_cannot_pass_unsupported_options
+    assert_raise(ArgumentError) { ActiveSupport::JSON.decode("", create_additions: true) }
   end
 end