diff --git a/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Include/Ia32/EdkIIGlueProcessorBind.h b/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Include/Ia32/EdkIIGlueProcessorBind.h
index 3e301aca04..17d3c4a380 100644
--- a/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Include/Ia32/EdkIIGlueProcessorBind.h
+++ b/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Include/Ia32/EdkIIGlueProcessorBind.h
@@ -28,7 +28,7 @@ Abstract:
 //  if the /OPT:REF linker option is used. We defined a macro as this is a 
 //  a non standard extension
 //
-#if _MSC_EXTENSIONS
+#ifdef _MSC_EXTENSIONS
   #define GLOBAL_REMOVE_IF_UNREFERENCED __declspec(selectany)
 #else
   #define GLOBAL_REMOVE_IF_UNREFERENCED