2 files changed, 3 insertions, 0 deletions
diff --git a/ext/tk/lib/tk.rb b/ext/tk/lib/tk.rb
index f831dbc78..c933f9db8 100644
--- a/ext/tk/lib/tk.rb
+++ b/ext/tk/lib/tk.rb
@@ -2131,6 +2131,8 @@ class TkTextWin<TkWindow
 end
 
 class TkListbox<TkTextWin
+  include Scrollable
+
   WidgetClassNames['Listbox'] = self
   def TkListbox.to_eval
     'Listbox'
diff --git a/ext/tk/lib/tkcanvas.rb b/ext/tk/lib/tkcanvas.rb
index 40bfa5484..c67bc456e 100644
--- a/ext/tk/lib/tkcanvas.rb
+++ b/ext/tk/lib/tkcanvas.rb
@@ -129,6 +129,7 @@ end
 
 class TkCanvas<TkWindow
   include TkTreatCItemFont
+  include Scrollable
 
   WidgetClassName = 'Canvas'.freeze
   WidgetClassNames[WidgetClassName] = self