diff --git a/MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c b/MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c
index e5e1b3d802..370d9b81b2 100644
--- a/MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c
+++ b/MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c
@@ -525,6 +525,7 @@ XhcInitSched (
     ASSERT (ScratchEntry != NULL);
     Xhc->ScratchEntry = ScratchEntry;
 
+    ScratchPhy = 0;
     Status = UsbHcAllocateAlignedPages (
                Xhc->PciIo,
                EFI_SIZE_TO_PAGES (MaxScratchpadBufs * sizeof (UINT64)),
@@ -542,6 +543,7 @@ XhcInitSched (
     // Allocate each scratch buffer
     //
     for (Index = 0; Index < MaxScratchpadBufs; Index++) {
+      ScratchEntryPhy = 0;
       Status = UsbHcAllocateAlignedPages (
                  Xhc->PciIo,
                  EFI_SIZE_TO_PAGES (Xhc->PageSize),