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-rw-r--r--ext/tk/lib/tkextlib/iwidgets/pushbutton.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/tk/lib/tkextlib/iwidgets/pushbutton.rb b/ext/tk/lib/tkextlib/iwidgets/pushbutton.rb
index c21007ca6c..ae56788289 100644
--- a/ext/tk/lib/tkextlib/iwidgets/pushbutton.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/pushbutton.rb
@@ -16,7 +16,7 @@ end
class Tk::Iwidgets::Pushbutton
TkCommandNames = ['::iwidgets::pushbutton'.freeze].freeze
WidgetClassName = 'Pushbutton'.freeze
- WidgetClassNames[WidgetClassName] = self
+ WidgetClassNames[WidgetClassName] ||= self
def __boolval_optkeys
super() << 'defaultring'