diff --git a/src/etc/inc/interfaces.inc b/src/etc/inc/interfaces.inc
index 4273a749b..73c243b51 100644
--- a/src/etc/inc/interfaces.inc
+++ b/src/etc/inc/interfaces.inc
@@ -3781,8 +3781,8 @@ function get_interface_mac($interface, $ifconfig_details = null)
 
     if (empty($ifconfig_details)) {
         $intf_details = legacy_interface_details($interface);
-    } elseif (!empty($ifconfig_details[$ifs])) {
-        $intf_details = $ifconfig_details[$ifs];
+    } elseif (!empty($ifconfig_details[$interface])) {
+        $intf_details = $ifconfig_details[$interface];
     }
 
     return $intf_details['macaddr'];