diff --git a/MdePkg/Include/Library/PalCallLib.h b/MdePkg/Include/Library/PalCallLib.h
index e3dde5990d..aefaebf55b 100644
--- a/MdePkg/Include/Library/PalCallLib.h
+++ b/MdePkg/Include/Library/PalCallLib.h
@@ -18,7 +18,6 @@
 #ifndef __PAL_CALL_LIB_H__
 #define __PAL_CALL_LIB_H__
 
-typedef  int PAL_CALL_RETURN;
 //
 // CacheType of PAL_CACHE_FLUSH.
 //