diff --git a/help.pl b/help.pl
index 7208a8a7cb..bb9c043ac6 100755
--- a/help.pl
+++ b/help.pl
@@ -32,13 +32,15 @@ our $refer = $query->param('url');
 $refer = $query->referer()  if !$refer || $refer eq 'undefined';
 
 $refer =~ /koha\/(.*)\.pl/;
-my $from = "modules/help/$1.tt";
+my $file = $1;
+$file =~ s/[^a-zA-Z0-9_\-\/]*//g;
+my $from = "modules/help/$file.tt";
 
 my $htdocs = C4::Context->config('intrahtdocs');
-my ( $theme, $lang ) = themelanguage( $htdocs, $from, "intranet", $query );
+my ( $theme, $lang ) = C4::Templates::themelanguage( $htdocs, $from, "intranet", $query );
 unless ( -e "$htdocs/$theme/$lang/$from" ) {
     $from = "modules/help/nohelp.tt";
-    ( $theme, $lang ) = themelanguage( $htdocs, $from, "intranet", $query );
+    ( $theme, $lang ) = C4::Templates::themelanguage( $htdocs, $from, "intranet", $query );
 }
 my $template = C4::Templates->new('intranet', "$htdocs/$theme/$lang/$from");
 $template->param( referer => $refer );