diff --git a/src/opnsense/scripts/interfaces/list_arp.py b/src/opnsense/scripts/interfaces/list_arp.py
index 6e39b6475..ed33d45fb 100755
--- a/src/opnsense/scripts/interfaces/list_arp.py
+++ b/src/opnsense/scripts/interfaces/list_arp.py
@@ -65,7 +65,7 @@ if __name__ == '__main__':
                           'hostname': ''
                           }
                 manufacturer_mac = EUI(record['mac'])
-		oui = manufacturer_mac.oui
+                oui = manufacturer_mac.oui
                 if oui.registration().org:
                     record['manufacturer'] = oui.registration().org
                 if record['ip'] in dhcp_leases: