diff --git a/activesupport/lib/active_support/core_ext/range.rb b/activesupport/lib/active_support/core_ext/range.rb
index c0736f3a44..2428a02242 100644
--- a/activesupport/lib/active_support/core_ext/range.rb
+++ b/activesupport/lib/active_support/core_ext/range.rb
@@ -2,3 +2,4 @@ require 'active_support/core_ext/range/blockless_step'
 require 'active_support/core_ext/range/conversions'
 require 'active_support/core_ext/range/include_range'
 require 'active_support/core_ext/range/overlaps'
+require 'active_support/core_ext/range/cover'
diff --git a/activesupport/lib/active_support/core_ext/range/cover.rb b/activesupport/lib/active_support/core_ext/range/cover.rb
new file mode 100644
index 0000000000..3a182cddd2
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/range/cover.rb
@@ -0,0 +1,3 @@
+class Range
+  alias_method(:cover?, :include?) unless instance_methods.include?(:cover?)
+end
diff --git a/activesupport/test/core_ext/range_ext_test.rb b/activesupport/test/core_ext/range_ext_test.rb
index 5701eeef28..1424fa4aca 100644
--- a/activesupport/test/core_ext/range_ext_test.rb
+++ b/activesupport/test/core_ext/range_ext_test.rb
@@ -62,4 +62,16 @@ class RangeTest < Test::Unit::TestCase
     (1..10).step(2) {|i| array << i }
     assert_equal [1,3,5,7,9], array
   end
+
+  if RUBY_VERSION < '1.9'
+    def test_cover
+      assert((1..3).cover?(2))
+      assert !(1..3).cover?(4)
+    end
+  else
+    def test_cover_is_not_override
+      range = (1..3)
+      assert range.method(:include?) != range.method(:cover?)
+    end
+  end
 end