diff --git a/ext/tk/lib/tkextlib/tcllib/plotchart.rb b/ext/tk/lib/tkextlib/tcllib/plotchart.rb
index 2f3d79d427..d2f3a0da3a 100644
--- a/ext/tk/lib/tkextlib/tcllib/plotchart.rb
+++ b/ext/tk/lib/tkextlib/tcllib/plotchart.rb
@@ -519,7 +519,7 @@ module Tk::Tcllib::Plotchart
   class Histogram < XYPlot
     TkCommandNames = [
       'canvas'.freeze,
-      '::Plotchart::createHistgram'.freeze
+      '::Plotchart::createHistogram'.freeze
     ].freeze
   end