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-rw-r--r--ext/tk/lib/tkextlib/blt/tabnotebook.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/tk/lib/tkextlib/blt/tabnotebook.rb b/ext/tk/lib/tkextlib/blt/tabnotebook.rb
index 738ba7c601..82936c67d3 100644
--- a/ext/tk/lib/tkextlib/blt/tabnotebook.rb
+++ b/ext/tk/lib/tkextlib/blt/tabnotebook.rb
@@ -11,7 +11,7 @@ module Tk::BLT
class Tabnotebook < Tabset
TkCommandNames = ['::blt::tabnotebook'.freeze].freeze
WidgetClassName = 'Tabnotebook'.freeze
- WidgetClassNames[WidgetClassName] = self
+ WidgetClassNames[WidgetClassName] ||= self
class Tab < Tk::BLT::Tabset::Tab
def self.new(parent, pos=nil, name=nil, keys={})