diff --git a/bin/mpw b/bin/mpw
index 8ee1305..1bdf835 100755
--- a/bin/mpw
+++ b/bin/mpw
@@ -45,7 +45,7 @@ I18n.locale         = lang.to_sym
 bin_dir = File.dirname(__FILE__)
 command = "#{bin_dir}/mpw-#{ARGV[0]}"
 
-if Dir.glob("#{bin_dir}/mpw-*").include?("#{command}")
+if Dir.glob("#{bin_dir}/mpw-*").include?(command.to_s)
   begin
     Kernel.load(command)
   rescue OptionParser::ParseError => e