diff --git a/ChangeLog b/ChangeLog
index bf648cf9f5..7c455ff44a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Sun Nov  4 11:27:54 2012  Masaki Matsushita  <glass.saga@gmail.com>
+
+	* array.c (recursive_equal): fix to return true when self and other
+	  are resized to same size and the current index become out of
+	  range.
+
+	* test/ruby/test_array.rb: add a test for the above.
+
 Sun Nov  4 10:19:03 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* dir.c (file_s_fnmatch): match with expanding braces if FNM_EXTGLOB
diff --git a/array.c b/array.c
index f4750696fd..1d526644c7 100644
--- a/array.c
+++ b/array.c
@@ -3282,8 +3282,10 @@ recursive_equal(VALUE ary1, VALUE ary2, int recur)
 	if (*p1 != *p2) {
 	    if (rb_equal(*p1, *p2)) {
 		len1 = RARRAY_LEN(ary1);
-		if (len1 != RARRAY_LEN(ary2) || len1 < i)
+		if (len1 != RARRAY_LEN(ary2))
 		    return Qfalse;
+		if (len1 < i)
+		    return Qtrue;
 		p1 = RARRAY_PTR(ary1) + i;
 		p2 = RARRAY_PTR(ary2) + i;
 	    }
diff --git a/test/ruby/test_array.rb b/test/ruby/test_array.rb
index b4115ac5dd..845a05089a 100644
--- a/test/ruby/test_array.rb
+++ b/test/ruby/test_array.rb
@@ -1923,6 +1923,20 @@ class TestArray < Test::Unit::TestCase
     assert_not_equal([0, 1, 2], [0, 1, 3])
   end
 
+  A = Array.new(3, &:to_s)
+  B = A.dup
+
+  def test_equal_resize
+    o = Object.new
+    def o.==(o)
+      A.clear
+      B.clear
+      true
+    end
+    A[1] = o
+    assert_equal(A, B)
+  end
+
   def test_hash2
     a = []
     a << a