diff --git a/EdkCompatibilityPkg/Foundation/Include/EfiStdArg.h b/EdkCompatibilityPkg/Foundation/Include/EfiStdArg.h
index 69b4567ae3..5697371b8a 100644
--- a/EdkCompatibilityPkg/Foundation/Include/EfiStdArg.h
+++ b/EdkCompatibilityPkg/Foundation/Include/EfiStdArg.h
@@ -90,6 +90,8 @@ Abstract:
 
 #define VA_END(Marker)                ((void)0)
 
+#define VA_COPY(Dest, Start)          __va_copy (Dest, Start)
+
 #elif defined(__GNUC__) && !defined(NO_BUILTIN_VA_FUNCS)
 //
 // Use GCC built-in macros for variable argument lists.
@@ -107,6 +109,8 @@ typedef __builtin_va_list VA_LIST;
 
 #define VA_END(Marker)               __builtin_va_end (Marker)
 
+#define VA_COPY(Dest, Start)         __builtin_va_copy (Dest, Start)
+
 #else
 
 #ifndef VA_START
@@ -165,6 +169,8 @@ typedef CHAR8 *VA_LIST;
 **/
 #define VA_END(Marker)      (Marker = (VA_LIST) 0)
 
+#define VA_COPY(dest, src) ((void)((dest) = (src)))
+
 #endif
 
 #endif