[htmltmpl] Trailing 1

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This probably has a very simple solution.  I am returning 
$template->output from a sub and then printing the results.  Every time, 
there's a trailing '1' at the end of the data.  How do I eliminate it?

index.tmpl:
<html>
   <head>
       <title>Hello</title>
   </head>
   <body>
       Hello World!
   </body>
</html>

print Show_HTML();

sub Show_HTML {
   my $template = HTML::Template->new(filename => 'index.tmpl');
   return $template->output;
}

Result:
Hello World!1