diff --git a/activesupport/lib/active_support/core_ext/object/to_param.rb b/activesupport/lib/active_support/core_ext/object/to_param.rb
index f2e7c2351e6ae..3a18e2a121f16 100644
--- a/activesupport/lib/active_support/core_ext/object/to_param.rb
+++ b/activesupport/lib/active_support/core_ext/object/to_param.rb
@@ -35,7 +35,8 @@ def to_param
 
 class Hash
   # Converts a hash into a string suitable for use as a URL query string. An optional <tt>namespace</tt> can be
-  # passed to enclose the param names (see example below).
+  # passed to enclose the param names (see example below). The keys in the query string are sorted lexicographically
+  # in ascending order.
   #
   # ==== Examples
   #   { :name => 'David', :nationality => 'Danish' }.to_param # => "name=David&nationality=Danish"
@@ -44,6 +45,6 @@ class Hash
   def to_param(namespace = nil)
     collect do |key, value|
       value.to_query(namespace ? "#{namespace}[#{key}]" : key)
-    end * '&'
+    end.sort * '&'
   end
 end
diff --git a/activesupport/test/core_ext/hash_ext_test.rb b/activesupport/test/core_ext/hash_ext_test.rb
index e5438745e00b8..0f35eb9e78d06 100644
--- a/activesupport/test/core_ext/hash_ext_test.rb
+++ b/activesupport/test/core_ext/hash_ext_test.rb
@@ -462,20 +462,24 @@ def test_string_hash
     assert_equal '', {}.to_param
     assert_equal 'hello=world', { :hello => "world" }.to_param
     assert_equal 'hello=10', { "hello" => 10 }.to_param
-    assert_equal 'hello=world&say_bye=true', ActiveSupport::OrderedHash[:hello, "world", "say_bye", true].to_param
+    assert_equal 'hello=world&say_bye=true', {:hello => "world", "say_bye" => true}.to_param
   end
 
   def test_number_hash
-    assert_equal '10=20&30=40&50=60', ActiveSupport::OrderedHash[10, 20, 30, 40, 50, 60].to_param
+    assert_equal '10=20&30=40&50=60', {10 => 20, 30 => 40, 50 => 60}.to_param
   end
 
   def test_to_param_hash
-    assert_equal 'custom=param-1&custom2=param2-1', ActiveSupport::OrderedHash[ToParam.new('custom'), ToParam.new('param'), ToParam.new('custom2'), ToParam.new('param2')].to_param
+    assert_equal 'custom2=param2-1&custom=param-1', {ToParam.new('custom') => ToParam.new('param'), ToParam.new('custom2') => ToParam.new('param2')}.to_param
   end
 
   def test_to_param_hash_escapes_its_keys_and_values
     assert_equal 'param+1=A+string+with+%2F+characters+%26+that+should+be+%3F+escaped', { 'param 1' => 'A string with / characters & that should be ? escaped' }.to_param
   end
+  
+  def test_to_param_orders_by_key_in_ascending_order
+    assert_equal 'a=2&b=1&c=0', ActiveSupport::OrderedHash[*%w(b 1 c 0 a 2)].to_param
+  end
 end
 
 class HashToXmlTest < Test::Unit::TestCase