diff --git a/MdePkg/Include/IndustryStandard/PeImage.h b/MdePkg/Include/IndustryStandard/PeImage.h
index 4703704934..4840b8dd8a 100644
--- a/MdePkg/Include/IndustryStandard/PeImage.h
+++ b/MdePkg/Include/IndustryStandard/PeImage.h
@@ -678,9 +678,6 @@ typedef struct {
   //
 } EFI_IMAGE_DEBUG_CODEVIEW_MTOC_ENTRY;
 
-// avoid conflict with windows header files
-#ifndef RUNTIME_FUNCTION_INDIRECT
-
 //
 // .pdata entries for X64
 //
@@ -690,8 +687,6 @@ typedef struct {
   UINT32    UnwindInfoAddress;
 } RUNTIME_FUNCTION;
 
-#endif
-
 typedef struct {
   UINT8    Version             : 3;
   UINT8    Flags               : 5;