diff --git a/ChangeLog b/ChangeLog
index 82ca655403..18eab62e9d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,7 @@
-Sat Jun  1 17:21:24 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Sat Jun  1 17:24:47 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* compile.c (iseq_set_arguments): not a simple single argument if any
+	  keyword arguments exist.  [ruby-core:55203] [Bug #8463]
 
 	* vm_insnhelper.c (vm_yield_setup_block_args): split single parameter
 	  if any keyword arguments exist, and then extract keyword arguments.
diff --git a/compile.c b/compile.c
index 70db48c6a0..e0ca056cd1 100644
--- a/compile.c
+++ b/compile.c
@@ -1276,7 +1276,8 @@ iseq_set_arguments(rb_iseq_t *iseq, LINK_ANCHOR *optargs, NODE *node_args)
 	}
 
 	if (iseq->type == ISEQ_TYPE_BLOCK) {
-	    if (iseq->arg_opts == 0 && iseq->arg_post_len == 0 && iseq->arg_rest == -1) {
+	    if (iseq->arg_opts == 0 && iseq->arg_post_len == 0 &&
+		iseq->arg_rest == -1 && iseq->arg_keyword == -1) {
 		if (iseq->argc == 1 && last_comma == 0) {
 		    /* {|a|} */
 		    iseq->arg_simple |= 0x02;
diff --git a/test/ruby/test_keyword.rb b/test/ruby/test_keyword.rb
index 4ff7c40321..c21afe4495 100644
--- a/test/ruby/test_keyword.rb
+++ b/test/ruby/test_keyword.rb
@@ -271,6 +271,8 @@ class TestKeywordArguments < Test::Unit::TestCase
     assert_equal(expect, pr.call(expect), bug8463)
     pr = proc {|a, *b, **opt| next a, *b, opt}
     assert_equal(expect, pr.call(expect), bug8463)
+    pr = proc {|a, **opt| next a, opt}
+    assert_equal(expect.values_at(0, -1), pr.call(expect), bug8463)
   end
 
   def test_bare_kwrest