diff --git a/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbUtility.c b/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbUtility.c
index 69eb926d01..2d2bd2a154 100644
--- a/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbUtility.c
+++ b/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbUtility.c
@@ -1028,7 +1028,7 @@ MatchUsbWwid (
   //
   // BugBug: only check serial number here, should check Interface Number, Device Vendor Id, Device Product Id  in later version
   //
-  if (StrDesc != NULL && !StrnCmp (StrDesc->String, SnString, StrDesc->Length)) {
+  if (StrDesc != NULL && (StrnCmp (StrDesc->String, SnString, StrDesc->Length) == 0)) {
 
     return TRUE;
   }