diff --git a/systemd/set_linger.cgi b/systemd/set_linger.cgi
index 99606afd5..2d54fef9e 100755
--- a/systemd/set_linger.cgi
+++ b/systemd/set_linger.cgi
@@ -17,9 +17,10 @@ my $user = clean_unit_value($in{'user'});
 my $enabled = $in{'enabled'};
 get_user_details($user) || error($text{'systemd_euser'});
 systemd_can_linger(\%access, $user) || systemd_acl_error('plinger');
-if (!defined($enabled) || $enabled !~ /^[01]$/) {
+if (!defined($enabled) || ($enabled ne '0' && $enabled ne '1')) {
 	error($text{'systemd_elinger'});
 	}
+$enabled = $enabled eq '1' ? 1 : 0;
 
 # Apply the requested linger state through loginctl.
 my ($ok, $out) = set_user_linger($user, $enabled);