1 files changed, 4 insertions, 1 deletions
diff --git a/ext/tk/lib/tk/canvas.rb b/ext/tk/lib/tk/canvas.rb
index c30fd79bb9..70cace3382 100644
--- a/ext/tk/lib/tk/canvas.rb
+++ b/ext/tk/lib/tk/canvas.rb
@@ -40,7 +40,7 @@ module TkCanvasItemConfig
   private :__item_pathname
 end
 
-class TkCanvas<TkWindow
+class Tk::Canvas<TkWindow
   include TkCanvasItemConfig
   include Tk::Scrollable
 
@@ -573,6 +573,9 @@ class TkCanvas<TkWindow
   end
 end
 
+TkCanvas = Tk::Canvas unless Object.const_defined? :TkCanvas
+
+
 class TkcItem<TkObject
   extend Tk
   include TkcTagAccess