diff --git a/opac/opac-tags_subject.pl b/opac/opac-tags_subject.pl
index a19f406db9..1859cab037 100755
--- a/opac/opac-tags_subject.pl
+++ b/opac/opac-tags_subject.pl
@@ -51,8 +51,8 @@ my ( $template, $loggedinuser, $cookie ) = get_template_and_user(
 
 my $number = $query->param('number') || 100;
 
-my $sth = $dbh->prepare("SELECT entry,weight FROM tags ORDER BY weight DESC LIMIT $number");
-$sth->execute;
+my $sth = $dbh->prepare("SELECT entry,weight FROM tags ORDER BY weight DESC LIMIT ?");
+$sth->execute($number);
 
 my %result;
 my $max=0;