diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5750398..d315884 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -82,6 +82,7 @@ For major (breaking) changes - **version 4, 3 and 2** - see end of page.
 
 | Version | Date       | Comment                                                                                             |
 | ------- | ---------- | --------------------------------------------------------------------------------------------------- |
+| 5.18.1  | 2023-06-07 | `networkInterfaces()` cleaned up testVirtualNic                                                     |
 | 5.18.0  | 2023-06-06 | `fsSize()` added optional drive parameter                                                           |
 | 5.17.17 | 2023-06-03 | `osInfo()` improved fqdn (linux)                                                                    |
 | 5.17.16 | 2023-05-30 | `usb()` fix parsing JSON (mac OS)                                                                   |
diff --git a/docs/history.html b/docs/history.html
index 47b5dba..90221cb 100644
--- a/docs/history.html
+++ b/docs/history.html
@@ -57,6 +57,11 @@
                     </tr>
                   </thead>
                   <tbody>
+                    <tr>
+                      <th scope="row">5.18.1</th>
+                      <td>2023-06-07</td>
+                      <td><span class="code">networkInterfaces()</span> cleaned up testVirtualNic</td>
+                    </tr>
                     <tr>
                       <th scope="row">5.18.0</th>
                       <td>2023-06-06</td>
diff --git a/docs/index.html b/docs/index.html
index 0451f61..8223b56 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -170,7 +170,7 @@
       <img class="logo" src="assets/logo.png" alt="logo">
       <div class="title">systeminformation</div>
       <div class="subtitle"><span id="typed"></span>&nbsp;</div>
-      <div class="version">New Version: <span id="version">5.18.0</span></div>
+      <div class="version">New Version: <span id="version">5.18.1</span></div>
       <button class="btn btn-light" onclick="location.href='https://github.com/sebhildebrandt/systeminformation'">View on Github <i class=" fab fa-github"></i></button>
     </div>
     <div class="down">
@@ -204,7 +204,7 @@
       </div>
       <div class="row number-section">
         <div class="col-xl-4 col-lg-4 col-md-4 col-12">
-          <div class="numbers">15,389</div>
+          <div class="numbers">15,423</div>
           <div class="title">Lines of code</div>
         </div>
         <div class="col-xl-4 col-lg-4 col-md-4 col-12">
diff --git a/lib/filesystem.js b/lib/filesystem.js
index 279fa26..3717b90 100644
--- a/lib/filesystem.js
+++ b/lib/filesystem.js
@@ -137,7 +137,7 @@ function fsSize(drive, callback) {
           }
         }
         if (_linux) {
-          cmd = 'export LC_ALL=C; df -lkPTx squashfs; unset LC_ALL';
+          cmd = 'df -lkPTx squashfs';
           execSync('cat /proc/mounts 2>/dev/null').toString().split('\n').filter(line => {
             return line.startsWith('/');
           }).forEach((line) => {
diff --git a/lib/network.js b/lib/network.js
index adada43..6f0253d 100644
--- a/lib/network.js
+++ b/lib/network.js
@@ -673,9 +673,9 @@ function getLinuxIfaceIEEE8021xState(authenticationProtocol) {
 }
 
 function testVirtualNic(iface, ifaceName, mac) {
-  const virtualMacs = ['00:00:00:00:00:00', '00:03:FF', '00:05:69', '00:0C:29', '00:0F:4B', '00:0F:4B', '00:13:07', '00:13:BE', '00:15:5d', '00:16:3E', '00:1C:42', '00:21:F6', '00:21:F6', '00:24:0B', '00:24:0B', '00:50:56', '00:A0:B1', '00:E0:C8', '08:00:27', '0A:00:27', '18:92:2C', '16:DF:49', '3C:F3:92', '54:52:00', 'FC:15:97'];
+  const virtualMacs = ['00:00:00:00:00:00', '00:03:FF', '00:05:69', '00:0C:29', '00:0F:4B', '00:13:07', '00:13:BE', '00:15:5d', '00:16:3E', '00:1C:42', '00:21:F6', '00:24:0B', '00:50:56', '00:A0:B1', '00:E0:C8', '08:00:27', '0A:00:27', '18:92:2C', '16:DF:49', '3C:F3:92', '54:52:00', 'FC:15:97'];
   if (mac) {
-    return virtualMacs.filter(item => { return mac.toUpperCase().toUpperCase().startsWith(item.substr(0, mac.length)); }).length > 0 ||
+    return virtualMacs.filter(item => { return mac.toUpperCase().toUpperCase().startsWith(item.substring(0, mac.length)); }).length > 0 ||
       iface.toLowerCase().indexOf(' virtual ') > -1 ||
       ifaceName.toLowerCase().indexOf(' virtual ') > -1 ||
       iface.toLowerCase().indexOf('vethernet ') > -1 ||