diff --git a/MdePkg/Library/BaseLib/Ipf/SwitchStack.s b/MdePkg/Library/BaseLib/Ipf/SwitchStack.s
index 33f2ed013f..1236bbe947 100644
--- a/MdePkg/Library/BaseLib/Ipf/SwitchStack.s
+++ b/MdePkg/Library/BaseLib/Ipf/SwitchStack.s
@@ -1,7 +1,7 @@
 /// @file
 ///  IPF specific SwitchStack() function
 ///
-/// Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+/// Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
 /// This program and the accompanying materials
 /// are licensed and made available under the terms and conditions of the BSD License
 /// which accompanies this distribution.  The full text of the license may be found at
@@ -27,7 +27,9 @@ AsmSwitchStackAndBackingStore::
         mov                 r17 = in1
         mov                 r18 = in2
         and                 r2  = r14, r2
-
+        
+        flushrs
+        
         mov                 ar.rsc = r2
         mov                 sp  = in3
         mov                 r19 = in4