diff --git a/lib/taiyaki.rb b/lib/taiyaki.rb
index 3c2ca04..83632e4 100644
--- a/lib/taiyaki.rb
+++ b/lib/taiyaki.rb
@@ -12,7 +12,7 @@ $KCODE = 'e'
 require 'jcode'
 
 begin
-  Kernel::require('progressbar')
+  require('progressbar')
 rescue LoadError
   $stderr.puts "WARNING:"
   $stderr.puts("  The required Ruby library 'progressbar' is not found.")