diff --git a/EdkModulePkg/Bus/Pci/Undi/RuntimeDxe/Decode.c b/EdkModulePkg/Bus/Pci/Undi/RuntimeDxe/Decode.c
index c3288438b7..02773d4e3d 100644
--- a/EdkModulePkg/Bus/Pci/Undi/RuntimeDxe/Decode.c
+++ b/EdkModulePkg/Bus/Pci/Undi/RuntimeDxe/Decode.c
@@ -22,7 +22,9 @@ Revision history:
 #include "undi32.h"
 
 
+#ifdef _MSC_EXTENSIONS
 #pragma data_seg("rtdata")
+#endif
 
 //
 // Global variables defined in this file
@@ -1648,4 +1650,6 @@ Returns:
   PxePtr->Fudge         = (UINT8) (PxePtr->Fudge - ChkSum ((VOID *) PxePtr, PxePtr->Len));
 }
 
+#ifdef _MSC_EXTENSIONS
 #pragma data_seg()
+#endif
diff --git a/EdkModulePkg/Bus/Pci/Undi/RuntimeDxe/E100b.c b/EdkModulePkg/Bus/Pci/Undi/RuntimeDxe/E100b.c
index bca0add42c..90ec85de19 100644
--- a/EdkModulePkg/Bus/Pci/Undi/RuntimeDxe/E100b.c
+++ b/EdkModulePkg/Bus/Pci/Undi/RuntimeDxe/E100b.c
@@ -3754,5 +3754,3 @@ Returns:
 
   return 0;
 }
-
-#pragma data_seg()