diff --git a/ChangeLog b/ChangeLog
index 41a8cbaa71..3733c10b78 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Oct  1 15:29:35 2007  Tanaka Akira  <akr@fsij.org>
+
+	* bootstraptest/runner.rb (assert_normal_exit): use `` instead of
+	  system.
+
 Mon Oct  1 15:17:48 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* gc.c (id2ref): T_VALUES is less than T_BLOCK.  [ruby-dev:31911]
diff --git a/bootstraptest/runner.rb b/bootstraptest/runner.rb
index 7dee5aee26..7b971dd500 100644
--- a/bootstraptest/runner.rb
+++ b/bootstraptest/runner.rb
@@ -171,7 +171,7 @@ def assert_normal_exit(testsrc, message = '')
   $stderr.puts "\##{@count} #{@location}" if @verbose
   faildesc = nil
   filename = make_srcfile(testsrc)
-  system("#{@ruby} -W0 #{filename}")
+  `#{@ruby} -W0 #{filename}`
   if $?.signaled?
     signo = $?.termsig
     signame = Signal.list.invert[signo]