diff --git a/etc/inc/captiveportal.inc b/etc/inc/captiveportal.inc
index 0f76b81d67..dd9d2e43cc 100644
--- a/etc/inc/captiveportal.inc
+++ b/etc/inc/captiveportal.inc
@@ -1412,14 +1412,14 @@ function getVolume($ip) {
 	if ($ipfwin[0]) {
 		$ipfwin = split(" ", $ipfwin[0]);
 		$volume['input_pkts'] = $ipfwin[2];
-		$volume['input_bytes'] = $ipfwin[3];
+		$volume['input_bytes'] = $ipfwin[4];
 	}
 
 	exec("/sbin/ipfw table 2 entrystats {$ip}", $ipfwout);
 	if ($ipfwout[0]) {
 		$ipfwout = split(" ", $ipfwout[0]);
 		$volume['output_pkts'] = $ipfwout[2];
-		$volume['output_bytes'] = $ipfwout[3];
+		$volume['output_bytes'] = $ipfwout[4];
 	}
 
 	return $volume;