diff --git a/activesupport/CHANGELOG b/activesupport/CHANGELOG
index 40e24d4ad47c7..a78c774634f92 100644
--- a/activesupport/CHANGELOG
+++ b/activesupport/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Array#to_query preserves its ordering.  #7756 [Greg Spurrier]
+
 * Out-of-range Time calculations transparently overflow to DateTime. Introduce Time#to_datetime.  #7706, #7715 [Geoff Buesing]
 
 * DateTime calculations analogous to the Date and Time extensions.  #7693 [Geoff Buesing]
diff --git a/activesupport/lib/active_support/core_ext/hash/conversions.rb b/activesupport/lib/active_support/core_ext/hash/conversions.rb
index 1cdf7d5c5417d..f0ce27508fb2e 100644
--- a/activesupport/lib/active_support/core_ext/hash/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/hash/conversions.rb
@@ -15,7 +15,7 @@ def to_query(key) #:nodoc:
 
 class Array
   def to_query(key) #:nodoc:
-    collect { |value| value.to_query("#{key}[]") }.sort * '&'
+    collect { |value| value.to_query("#{key}[]") } * '&'
   end
 end
 
diff --git a/activesupport/test/core_ext/hash_ext_test.rb b/activesupport/test/core_ext/hash_ext_test.rb
index 8a120fdfeee00..64d550aaf5bcf 100644
--- a/activesupport/test/core_ext/hash_ext_test.rb
+++ b/activesupport/test/core_ext/hash_ext_test.rb
@@ -544,7 +544,7 @@ def empty.to_param; nil end
   end
 
   def test_nested_conversion
-    assert_query_equal 'person%5Bname%5D=Nicholas&person%5Blogin%5D=seckar',
+    assert_query_equal 'person%5Blogin%5D=seckar&person%5Bname%5D=Nicholas',
       :person => {:name => 'Nicholas', :login => 'seckar'}
   end
 
@@ -558,8 +558,13 @@ def test_array_values
       :person => {:id => [10, 20]}
   end
 
+  def test_array_values_are_not_sorted
+    assert_query_equal 'person%5Bid%5D%5B%5D=20&person%5Bid%5D%5B%5D=10',
+      :person => {:id => [20, 10]}
+  end
+
   private
     def assert_query_equal(expected, actual, message = nil)
-      assert_equal expected.split('&').sort, actual.to_query.split('&').sort
+      assert_equal expected.split('&'), actual.to_query.split('&')
     end
 end