diff --git a/ChangeLog b/ChangeLog
index 69a2ad6810..5101b1e2f0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Feb  8 22:39:09 2007  Koichi Sasada  <ko1@atdot.net>
+
+	* yarvtest/yarvtest.rb: check target command names.
+
 Thu Feb  8 22:31:45 2007  Koichi Sasada  <ko1@atdot.net>
 
 	* test/ruby/test_clone.rb: fix to current spec
diff --git a/yarvtest/yarvtest.rb b/yarvtest/yarvtest.rb
index 04cfd257e4..56c173bbe0 100644
--- a/yarvtest/yarvtest.rb
+++ b/yarvtest/yarvtest.rb
@@ -17,8 +17,10 @@ ARGV.each{|opt|
   end
 }
 
-puts "matzruby: #{`#{$matzruby} -v`}"
-puts "ruby    : #{`#{$ruby} -v`}"
+a = "matzruby: #{`#{$matzruby} -v`}"
+b = "ruby    : #{`#{$ruby} -v`}"
+puts a, b
+raise "Using same command" if a == b
 
 class YarvTestBase < Test::Unit::TestCase
   def initialize *args