diff --git a/signal.c b/signal.c
index c29a3fbc42..6f6b5452a9 100644
--- a/signal.c
+++ b/signal.c
@@ -71,12 +71,12 @@ static const struct signals {
 #ifdef SIGTRAP
     {"TRAP", SIGTRAP},
 #endif
-#ifdef SIGIOT
-    {"IOT", SIGIOT},
-#endif
 #ifdef SIGABRT
     {"ABRT", SIGABRT},
 #endif
+#ifdef SIGIOT
+    {"IOT", SIGIOT},
+#endif
 #ifdef SIGEMT
     {"EMT", SIGEMT},
 #endif
diff --git a/test/ruby/envutil.rb b/test/ruby/envutil.rb
index 80e43346d9..9ff414c367 100644
--- a/test/ruby/envutil.rb
+++ b/test/ruby/envutil.rb
@@ -220,7 +220,7 @@ module Test
         pid = status.pid
         faildesc = proc do
           signo = status.termsig
-          signame = Signal.list.invert[signo]
+          signame = Signal.signame(signo)
           sigdesc = "signal #{signo}"
           if signame
             sigdesc = "SIG#{signame} (#{sigdesc})"
@@ -270,7 +270,7 @@ module Test
       def assert_ruby_status(args, test_stdin="", message=nil, opt={})
         out, _, status = EnvUtil.invoke_ruby(args, test_stdin, true, :merge_to_stdout, opt)
         message ||= "ruby exit status is not success:"
-        assert(status.success?, FailDesc[status, message, out])
+        assert(status.success?, FailDesc[status, "#{message} (#{status.inspect})", out])
       end
 
       ABORT_SIGNALS = Signal.list.values_at(*%w"ILL ABRT BUS SEGV")