diff --git a/MdeModulePkg/Universal/Disk/PartitionDxe/Mbr.c b/MdeModulePkg/Universal/Disk/PartitionDxe/Mbr.c
index 1946334525..377fb19319 100644
--- a/MdeModulePkg/Universal/Disk/PartitionDxe/Mbr.c
+++ b/MdeModulePkg/Universal/Disk/PartitionDxe/Mbr.c
@@ -132,7 +132,7 @@ PartitionInstallMbrChildHandles (
   EFI_STATUS                Status;
   MASTER_BOOT_RECORD        *Mbr;
   UINT32                    ExtMbrStartingLba;
-  UINTN                     Index;
+  UINT32                    Index;
   HARDDRIVE_DEVICE_PATH     HdDev;
   HARDDRIVE_DEVICE_PATH     ParentHdDev;
   EFI_STATUS                Found;