diff --git a/enumerator/enumerator.go b/enumerator/enumerator.go
index 6f0f32d..a253a17 100644
--- a/enumerator/enumerator.go
+++ b/enumerator/enumerator.go
@@ -15,6 +15,7 @@ type PortDetails struct {
 	IsUSB        bool
 	VID          string
 	PID          string
+        MI           string
 	SerialNumber string
 
 	// Manufacturer string
diff --git a/enumerator/usb_linux.go b/enumerator/usb_linux.go
index bad2323..15b20d7 100644
--- a/enumerator/usb_linux.go
+++ b/enumerator/usb_linux.go
@@ -72,6 +72,10 @@ func parseUSBSysFS(usbDevicePath string, details *PortDetails) error {
 	if err != nil {
 		return err
 	}
+	mi, err := readLine(filepath.Join(usbDevicePath, "bInterfaceNumber"))
+	if err != nil {
+		return err
+	}
 	serial, err := readLine(filepath.Join(usbDevicePath, "serial"))
 	if err != nil {
 		return err
@@ -88,6 +92,7 @@ func parseUSBSysFS(usbDevicePath string, details *PortDetails) error {
 	details.IsUSB = true
 	details.VID = vid
 	details.PID = pid
+	details.MI = mi
 	details.SerialNumber = serial
 	//details.Manufacturer = manufacturer
 	//details.Product = product
diff --git a/enumerator/usb_windows.go b/enumerator/usb_windows.go
index b69e115..8b5f172 100644
--- a/enumerator/usb_windows.go
+++ b/enumerator/usb_windows.go
@@ -18,32 +18,34 @@ import (
 func parseDeviceID(deviceID string, details *PortDetails) {
 	// Windows stock USB-CDC driver
 	if len(deviceID) >= 3 && deviceID[:3] == "USB" {
-		re := regexp.MustCompile("VID_(....)&PID_(....)(\\\\(\\w+)$)?").FindAllStringSubmatch(deviceID, -1)
-		if re == nil || len(re[0]) < 2 {
+		re := regexp.MustCompile("VID_(....)&PID_(....)&MI_(..)(\\\\(\\w+)$)?").FindAllStringSubmatch(deviceID, -1)
+		if re == nil || len(re[0]) < 3 {
 			// Silently ignore unparsable strings
 			return
 		}
 		details.IsUSB = true
 		details.VID = re[0][1]
 		details.PID = re[0][2]
-		if len(re[0]) >= 4 {
-			details.SerialNumber = re[0][4]
+		details.MI = re[0][3]
+		if len(re[0]) >= 5 {
+			details.SerialNumber = re[0][5]
 		}
 		return
 	}
 
 	// FTDI driver
 	if len(deviceID) >= 7 && deviceID[:7] == "FTDIBUS" {
-		re := regexp.MustCompile("VID_(....)\\+PID_(....)(\\+(\\w+))?").FindAllStringSubmatch(deviceID, -1)
-		if re == nil || len(re[0]) < 2 {
+		re := regexp.MustCompile("VID_(....)\\+PID_(....)+MI_(..)(\\+(\\w+))?").FindAllStringSubmatch(deviceID, -1)
+		if re == nil || len(re[0]) < 3 {
 			// Silently ignore unparsable strings
 			return
 		}
 		details.IsUSB = true
 		details.VID = re[0][1]
 		details.PID = re[0][2]
-		if len(re[0]) >= 4 {
-			details.SerialNumber = re[0][4]
+		details.MI = re[0][3]
+		if len(re[0]) >= 5 {
+			details.SerialNumber = re[0][5]
 		}
 		return
 	}