diff --git a/ArmPkg/Library/BdsLib/BdsLinuxFdt.c b/ArmPkg/Library/BdsLib/BdsLinuxFdt.c
index 57d8dcc907..58db0bdd66 100644
--- a/ArmPkg/Library/BdsLib/BdsLinuxFdt.c
+++ b/ArmPkg/Library/BdsLib/BdsLinuxFdt.c
@@ -264,7 +264,7 @@ RelocateFdt (
 {
   EFI_STATUS            Status;
   INTN                  Error;
-  UINT32                FdtAlignment;
+  UINT64                FdtAlignment;
 
   *RelocatedFdtSize = OriginalFdtSize + FDT_ADDITIONAL_ENTRIES_SIZE;