diff --git a/README.md b/README.md
index 54382d80..406ef742 100644
--- a/README.md
+++ b/README.md
@@ -128,6 +128,7 @@ si.cpu()
 
 (last 7 major and minor version releases)
 
+- Version 5.23.0: `usb()` added serial number (linux)
 - Version 5.22.0: `wifiConnections()` added signal quality
 - Version 5.21.0: `graphics()` added subVendor (linux)
 - Version 5.20.0: `mem()` added writeback and dirty (linux)
diff --git a/lib/usb.js b/lib/usb.js
index 8e9d354b..0a6edba9 100644
--- a/lib/usb.js
+++ b/lib/usb.js
@@ -114,7 +114,6 @@ function getDarwinUsbType(name) {
   return result;
 }
 
-
 function parseDarwinUsb(usb, id) {
   const result = {};
   result.id = id;
@@ -258,7 +257,7 @@ function usb(callback) {
             const parts = stdout.toString().split(/\n\s*\n/);
             for (let i = 0; i < parts.length; i++) {
               const usb = parseWindowsUsb(parts[i].split('\n'), i);
-              if (usb) {
+              if (usb && result.filter(x => x.deviceId === usb.deviceId).length === 0) {
                 result.push(usb);
               }
             }