diff --git a/DuetPkg/PciBusNoEnumerationDxe/PciIo.c b/DuetPkg/PciBusNoEnumerationDxe/PciIo.c
index 03fc0944a7..55d16b64cb 100644
--- a/DuetPkg/PciBusNoEnumerationDxe/PciIo.c
+++ b/DuetPkg/PciBusNoEnumerationDxe/PciIo.c
@@ -1713,6 +1713,8 @@ Returns:
         //
         Ptr->AddrSpaceGranularity = 64;
         break;
+      default:
+        break;
       }
 
       Ptr = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) ((UINT8 *) Ptr + sizeof (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR));