diff --git a/OldMdePkg/Include/Library/PalCallLib.h b/OldMdePkg/Include/Library/PalCallLib.h
index 169e90a837..40d9f4449a 100644
--- a/OldMdePkg/Include/Library/PalCallLib.h
+++ b/OldMdePkg/Include/Library/PalCallLib.h
@@ -1329,6 +1329,9 @@ typedef struct {
 **/
 #define PAL_PERF_MON_INFO 15
 
+#define PAL_PLATFORM_ADDR_INTERRUPT_BLOCK_TOKEN                       0x0
+#define PAL_PLATFORM_ADDR_IO_BLOCK_TOKEN                              0x1
+
 /**
   
   PAL Procedure - PAL_PLATFORM_ADDR.