diff --git a/OldMdePkg/Include/Library/PalCallLib.h b/OldMdePkg/Include/Library/PalCallLib.h
index 235ba99fe8..169e90a837 100644
--- a/OldMdePkg/Include/Library/PalCallLib.h
+++ b/OldMdePkg/Include/Library/PalCallLib.h
@@ -18,6 +18,8 @@
 #ifndef __PAL_CALL_LIB_H__
 #define __PAL_CALL_LIB_H__
 
+#define PAL_SUCCESS             0x0
+
 //
 // CacheType of PAL_CACHE_FLUSH.
 //