diff --git a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.c b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.c
index da5559ae76..43626fff48 100644
--- a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.c
+++ b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.c
@@ -1544,6 +1544,8 @@ BuildAdmaDescTable (
       PciIo,
       Trb->AdmaMap
     );
+    Trb->AdmaMap = NULL;
+
     PciIo->FreeBuffer (
       PciIo,
       EFI_SIZE_TO_PAGES (TableSize),
@@ -1753,7 +1755,6 @@ SdMmcCreateTrb (
       }
       Status = BuildAdmaDescTable (Trb, Private->ControllerVersion[Slot]);
       if (EFI_ERROR (Status)) {
-        PciIo->Unmap (PciIo, Trb->DataMap);
         goto Error;
       }
     } else if (Private->Capability[Slot].Sdma != 0) {