diff --git a/ChangeLog b/ChangeLog
index edaa768d88..6b09fe7ee9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Mar  3 22:25:24 2015  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* test/lib/envutil.rb (EnvUtil.invoke_ruby): need to rescue because
+	  Signal.signame may raise exception.
+
 Tue Mar  3 16:57:39 2015  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* tool/redmine-backporter.rb: use 'b' instead of 's' for showing
diff --git a/test/lib/envutil.rb b/test/lib/envutil.rb
index 8d4dc707c7..fab8de9a95 100644
--- a/test/lib/envutil.rb
+++ b/test/lib/envutil.rb
@@ -70,7 +70,7 @@ module EnvUtil
       unless (!th_stdout || th_stdout.join(timeout)) && (!th_stderr || th_stderr.join(timeout))
         signals = Array(signal).select do |sig|
           DEFAULT_SIGNALS[sig.to_s] or
-            DEFAULT_SIGNALS[Signal.signame(sig)]
+            DEFAULT_SIGNALS[Signal.signame(sig)] rescue false
         end
         signals |= [:KILL]
         case pgroup = opt[:pgroup]