diff --git a/MdeModulePkg/Bus/Pci/XhciDxe/XhciReg.c b/MdeModulePkg/Bus/Pci/XhciDxe/XhciReg.c
index 89f073e1d8..3ed1a55f98 100644
--- a/MdeModulePkg/Bus/Pci/XhciDxe/XhciReg.c
+++ b/MdeModulePkg/Bus/Pci/XhciDxe/XhciReg.c
@@ -609,7 +609,7 @@ XhcSetHsee (
                         PciIo,
                         EfiPciIoWidthUint16,
                         PCI_COMMAND_OFFSET,
-                        sizeof (XhciCmd),
+                        sizeof (XhciCmd) / sizeof (UINT16),
                         &XhciCmd
                         );
   if (!EFI_ERROR (Status)) {