diff --git a/ChangeLog b/ChangeLog
index 30488f2e88..0b3aee85fd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu Feb  2 17:51:02 2012  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* io.c (argf_next_argv): reset ARGF.next_p on ARGV.replace.
+	  r34409 breaks replacing ARGV.
+	  [ruby-dev:45160] [Bug #5952]
+
 Thu Feb  2 16:21:01 2012  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* test/net/http/test_http.rb (TestNetHTTPKeepAlive#*): remove debug
diff --git a/io.c b/io.c
index 4bf65d9bdf..7bf5543d62 100644
--- a/io.c
+++ b/io.c
@@ -7306,6 +7306,14 @@ argf_next_argv(VALUE argf)
 	}
 	ARGF.init_p = 1;
     }
+    else {
+	if (NIL_P(ARGF.argv)) {
+	    ARGF.next_p = -1;
+	}
+	else if (ARGF.next_p == -1 && RARRAY_LEN(ARGF.argv) > 0) {
+	    ARGF.next_p = 1;
+	}
+    }
 
     if (ARGF.next_p == 1) {
       retry:
diff --git a/test/ruby/test_argf.rb b/test/ruby/test_argf.rb
index 1480ce1c41..2f1ddf5391 100644
--- a/test/ruby/test_argf.rb
+++ b/test/ruby/test_argf.rb
@@ -678,6 +678,16 @@ class TestArgf < Test::Unit::TestCase
     end
   end
 
+  def test_close_replace
+    ruby('-e', <<-SRC) do |f|
+      ARGF.close
+      ARGV.replace ['#{@t1.path}', '#{@t2.path}', '#{@t3.path}']
+      puts ARGF.read
+    SRC
+      assert_equal("1\n2\n3\n4\n5\n6\n", f.read)
+    end
+  end
+
   def test_closed
     ruby('-e', <<-SRC, @t1.path, @t2.path, @t3.path) do |f|
       3.times do