From 4b298ad77a8388f0aae62daeca66659a8effeade Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 30 Aug 2016 06:22:30 +0000
Subject: Use qualified names

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56037 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/debug.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib/debug.rb')

diff --git a/lib/debug.rb b/lib/debug.rb
index 5d754d8ebb..394a53e172 100644
--- a/lib/debug.rb
+++ b/lib/debug.rb
@@ -182,7 +182,7 @@ SCRIPT_LINES__ = {} unless defined? SCRIPT_LINES__ # :nodoc:
 # Debug is not available in safe mode.
 
 class DEBUGGER__
-  MUTEX = Mutex.new # :nodoc:
+  MUTEX = Thread::Mutex.new # :nodoc:
 
   class Context # :nodoc:
     DEBUG_LAST_CMD = []
-- 
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