Index: range.c
===================================================================
--- range.c	(revision 22362)
+++ range.c	(working copy)
@@ -125,7 +125,7 @@
 {
     if (range == obj)
 	return Qtrue;
-    if (!rb_obj_is_instance_of(obj, rb_obj_class(range)))
+    if (!rb_obj_is_kind_of(obj, rb_cRange))
 	return Qfalse;
 
     if (!rb_equal(RANGE_BEG(range), RANGE_BEG(obj)))
@@ -187,7 +187,7 @@
 {
     if (range == obj)
 	return Qtrue;
-    if (!rb_obj_is_instance_of(obj, rb_obj_class(range)))
+    if (!rb_obj_is_kind_of(obj, rb_cRange))
 	return Qfalse;
 
     if (!rb_eql(RANGE_BEG(range), RANGE_BEG(obj)))
Index: test/ruby/test_range.rb
===================================================================
--- test/ruby/test_range.rb	(revision 22362)
+++ test/ruby/test_range.rb	(working copy)
@@ -89,6 +89,8 @@
     assert(r != (1..2))
     assert(r != (0..2))
     assert(r != (0...1))
+    subclass = Class.new(Range)
+    assert(r == subclass.new(0,1))
   end
 
   def test_eql
@@ -99,6 +101,8 @@
     assert(!r.eql?(1..2))
     assert(!r.eql?(0..2))
     assert(!r.eql?(0...1))
+    subclass = Class.new(Range)
+    assert(r.eql?(subclass.new(0,1)))
   end
 
   def test_hash