1 files changed, 4 insertions, 3 deletions
diff --git a/ext/tk/lib/multi-tk.rb b/ext/tk/lib/multi-tk.rb
index 4f39874d30..4bc89a8147 100644
--- a/ext/tk/lib/multi-tk.rb
+++ b/ext/tk/lib/multi-tk.rb
@@ -2214,11 +2214,12 @@ end
 
 # event loop
 # all master/slave IPs are controled by only one event-loop
-class << MultiTkIp
-  def default_master?
+class MultiTkIp
+  def self.default_master?
     __getip == @@DEFAULT_MASTER
   end
-
+end
+class << MultiTkIp
   def mainloop(check_root = true)
     __getip.mainloop(check_root)
   end