diff --git a/ChangeLog b/ChangeLog
index bd816352fe..f7ba56a348 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Nov 30 18:22:10 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* complex.c (nucomp_rationalize): fix function.  [ruby-core:40667]
+	  [Bug #5546]
+
 Thu Nov 17 10:36:46 2011  Aaron Patterson <aaron@tenderlovemaking.com>
 
 	* ext/psych/lib/psych.rb (load_file): make sure opened yaml files are
diff --git a/complex.c b/complex.c
index a701129b73..1617054816 100644
--- a/complex.c
+++ b/complex.c
@@ -1374,7 +1374,7 @@ nucomp_rationalize(int argc, VALUE *argv, VALUE self)
        rb_raise(rb_eRangeError, "can't convert %s into Rational",
                 StringValuePtr(s));
     }
-    return rb_funcall(dat->real, rb_intern("rationalize"), argc, argv);
+    return rb_funcall2(dat->real, rb_intern("rationalize"), argc, argv);
 }
 
 /*
diff --git a/test/ruby/test_complex.rb b/test/ruby/test_complex.rb
index 7ff64927ac..b2f9e8dff0 100644
--- a/test/ruby/test_complex.rb
+++ b/test/ruby/test_complex.rb
@@ -16,6 +16,7 @@ class Complex_Test < Test::Unit::TestCase
   def test_rationalize
     assert_equal(1.quo(3), Complex(1/3.0, 0).rationalize, '[ruby-core:38885]')
     assert_equal(1.quo(5), Complex(0.2, 0).rationalize, '[ruby-core:38885]')
+    assert_equal(5.quo(2), Complex(2.5, 0).rationalize(0), '[ruby-core:40667]')
   end
 
   def test_compsub
diff --git a/version.h b/version.h
index 937b374b47..dcbf7403ff 100644
--- a/version.h
+++ b/version.h
@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.3"
-#define RUBY_PATCHLEVEL 4
+#define RUBY_PATCHLEVEL 5
 
 #define RUBY_RELEASE_DATE "2011-11-30"
 #define RUBY_RELEASE_YEAR 2011