diff --git a/ChangeLog b/ChangeLog
index c90c50611b..8118579176 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,7 @@
-Fri Dec 14 14:58:37 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Fri Dec 14 14:59:14 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* test/ruby/envutil.rb (Test::Unit::Assertions#assert_separately):
+	  take file and line by using caller_locations if not given.
 
 	* test/ruby/envutil.rb (Test::Unit::Assertions#assert_separately):
 	  count assertions in separated tests.
diff --git a/test/ruby/envutil.rb b/test/ruby/envutil.rb
index dcdd857798..6006ae75b4 100644
--- a/test/ruby/envutil.rb
+++ b/test/ruby/envutil.rb
@@ -193,8 +193,12 @@ module Test
         assert(status.success?, m)
       end
 
-      def assert_separately(args, file, line, src)
-        opt = {}
+      def assert_separately(args, file = nil, line = nil, src, **opt)
+        unless file and line
+          loc, = caller_locations(1,1)
+          file ||= loc.path
+          line ||= loc.lineno
+        end
         src = <<eom
   require 'test/unit';include Test::Unit::Assertions;begin;#{src}
   ensure