diff --git a/Nt32Pkg/FvbServicesRuntimeDxe/FWBlockService.c b/Nt32Pkg/FvbServicesRuntimeDxe/FWBlockService.c
index c2245f48c9..7b00fd9b3a 100644
--- a/Nt32Pkg/FvbServicesRuntimeDxe/FWBlockService.c
+++ b/Nt32Pkg/FvbServicesRuntimeDxe/FWBlockService.c
@@ -1088,7 +1088,7 @@ Returns:
 
   FvbDevice = FVB_DEVICE_FROM_THIS (This);
 
-  return FvbWriteBlock (FvbDevice->Instance, Lba, Offset, NumBytes, Buffer, mFvbModuleGlobal, EfiGoneVirtual ());
+  return FvbWriteBlock (FvbDevice->Instance, (EFI_LBA)Lba, (UINTN)Offset, NumBytes, (UINT8 *)Buffer, mFvbModuleGlobal, EfiGoneVirtual ());
 }
 
 EFI_STATUS