diff --git a/MdeModulePkg/Bus/Pci/XhciPei/XhciSched.c b/MdeModulePkg/Bus/Pci/XhciPei/XhciSched.c
index 3ae1511222..aedc2e8dc0 100644
--- a/MdeModulePkg/Bus/Pci/XhciPei/XhciSched.c
+++ b/MdeModulePkg/Bus/Pci/XhciPei/XhciSched.c
@@ -2618,6 +2618,7 @@ XhcPeiInitSched (
     ASSERT (ScratchEntry != NULL);
     Xhc->ScratchEntry = ScratchEntry;
 
+    ScratchPhy = 0;
     Status = UsbHcAllocateAlignedPages (
                EFI_SIZE_TO_PAGES (MaxScratchpadBufs * sizeof (UINT64)),
                Xhc->PageSize,
@@ -2633,6 +2634,7 @@ XhcPeiInitSched (
     // Allocate each scratch buffer
     //
     for (Index = 0; Index < MaxScratchpadBufs; Index++) {
+      ScratchEntryPhy = 0;
       Status = UsbHcAllocateAlignedPages (
                  EFI_SIZE_TO_PAGES (Xhc->PageSize),
                  Xhc->PageSize,