diff --git a/MdePkg/Include/Ia32/ProcessorBind.h b/MdePkg/Include/Ia32/ProcessorBind.h
index e2e397a818..45e9c14bf3 100644
--- a/MdePkg/Include/Ia32/ProcessorBind.h
+++ b/MdePkg/Include/Ia32/ProcessorBind.h
@@ -176,10 +176,10 @@ typedef INT32   INTN;
   // Microsoft* compiler requires _EFIAPI useage, __cdecl is Microsoft* specific C.
   // 
   #define EFIAPI __cdecl  
-#endif
-
-#if __GNUC__
-  #define EFIAPI __attribute__((cdecl))    
+#else
+  #if __GNUC__
+    #define EFIAPI __attribute__((cdecl))  
+  #endif  
 #endif
 
 //