diff --git a/ArmPlatformPkg/Library/PL031RealTimeClockLib/PL031RealTimeClockLib.c b/ArmPlatformPkg/Library/PL031RealTimeClockLib/PL031RealTimeClockLib.c
index 6ab3e99483..fb353cf2df 100644
--- a/ArmPlatformPkg/Library/PL031RealTimeClockLib/PL031RealTimeClockLib.c
+++ b/ArmPlatformPkg/Library/PL031RealTimeClockLib/PL031RealTimeClockLib.c
@@ -331,13 +331,13 @@ LibRtcInitialize (
                   EfiGcdMemoryTypeMemoryMappedIo,
                   mPL031RtcBase,
                   SIZE_4KB,
-                  EFI_MEMORY_UC | EFI_MEMORY_RUNTIME
+                  EFI_MEMORY_UC | EFI_MEMORY_RUNTIME | EFI_MEMORY_XP
                   );
   if (EFI_ERROR (Status)) {
     return Status;
   }
 
-  Status = gDS->SetMemorySpaceAttributes (mPL031RtcBase, SIZE_4KB, EFI_MEMORY_UC | EFI_MEMORY_RUNTIME);
+  Status = gDS->SetMemorySpaceAttributes (mPL031RtcBase, SIZE_4KB, EFI_MEMORY_UC | EFI_MEMORY_RUNTIME | EFI_MEMORY_XP);
   if (EFI_ERROR (Status)) {
     return Status;
   }