diff --git a/includes/discovery/sensors/voltage/rfc1628.inc.php b/includes/discovery/sensors/voltage/rfc1628.inc.php
index eb7a2cbf78..dec23272c2 100644
--- a/includes/discovery/sensors/voltage/rfc1628.inc.php
+++ b/includes/discovery/sensors/voltage/rfc1628.inc.php
@@ -103,7 +103,7 @@ foreach ($bypass_volts as $index => $data) {
     }
     if (is_array($data['upsBypassVoltage'])) {
         $data['upsBypassVoltage'] = $data['upsBypassVoltage'][0];
-        $vold_oid .= '.0';
+        $volt_oid .= '.0';
     }
 
     discover_sensor(
diff --git a/tests/data/istars.json b/tests/data/istars.json
index dc0f3d0738..1cf72fae69 100644
--- a/tests/data/istars.json
+++ b/tests/data/istars.json
@@ -937,7 +937,7 @@
                     "sensor_deleted": 0,
                     "sensor_class": "voltage",
                     "poller_type": "snmp",
-                    "sensor_oid": ".1.3.6.1.2.1.33.1.5.3.1.2.1",
+                    "sensor_oid": ".1.3.6.1.2.1.33.1.5.3.1.2.1.0",
                     "sensor_index": "201",
                     "sensor_type": "rfc1628",
                     "sensor_descr": "Bypass",
@@ -1524,14 +1524,14 @@
                     "sensor_deleted": 0,
                     "sensor_class": "voltage",
                     "poller_type": "snmp",
-                    "sensor_oid": ".1.3.6.1.2.1.33.1.5.3.1.2.1",
+                    "sensor_oid": ".1.3.6.1.2.1.33.1.5.3.1.2.1.0",
                     "sensor_index": "201",
                     "sensor_type": "rfc1628",
                     "sensor_descr": "Bypass",
                     "group": null,
                     "sensor_divisor": 1,
                     "sensor_multiplier": 1,
-                    "sensor_current": 0,
+                    "sensor_current": 224.0,
                     "sensor_limit": 257.6,
                     "sensor_limit_warn": null,
                     "sensor_limit_low": 190.4,
@@ -1540,7 +1540,7 @@
                     "sensor_custom": "No",
                     "entPhysicalIndex": null,
                     "entPhysicalIndex_measured": null,
-                    "sensor_prev": 224,
+                    "sensor_prev": null,
                     "user_func": null,
                     "state_name": null
                 }