diff --git a/MdeModulePkg/Bus/Pci/UhciPei/UhcPeim.c b/MdeModulePkg/Bus/Pci/UhciPei/UhcPeim.c
index b897c3f82c..a05834da3c 100644
--- a/MdeModulePkg/Bus/Pci/UhciPei/UhcPeim.c
+++ b/MdeModulePkg/Bus/Pci/UhciPei/UhcPeim.c
@@ -274,6 +274,8 @@ UhcControlTransfer (
 
   PktID       = INPUT_PACKET_ID;
 
+  RequestMap  = NULL;
+
   if (Request == NULL || TransferResult == NULL) {
     return EFI_INVALID_PARAMETER;
   }