diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf
index bce6d00180..ca88b0c95c 100644
--- a/MdePkg/Library/BaseLib/BaseLib.inf
+++ b/MdePkg/Library/BaseLib/BaseLib.inf
@@ -467,6 +467,7 @@
   X64/DisablePaging64.asm | MSFT
   X64/Mwait.nasm| MSFT
   X64/Mwait.asm | MSFT
+  X64/Monitor.nasm| MSFT
   X64/Monitor.asm | MSFT
   X64/ReadPmc.asm | MSFT
   X64/ReadTsc.asm | MSFT
@@ -550,6 +551,7 @@
   X64/DisablePaging64.asm | INTEL
   X64/Mwait.nasm| INTEL
   X64/Mwait.asm | INTEL
+  X64/Monitor.nasm| INTEL
   X64/Monitor.asm | INTEL
   X64/ReadPmc.asm | INTEL
   X64/ReadTsc.asm | INTEL
diff --git a/MdePkg/Library/BaseLib/X64/Monitor.nasm b/MdePkg/Library/BaseLib/X64/Monitor.nasm
new file mode 100644
index 0000000000..a5ec3fa75d
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/Monitor.nasm
@@ -0,0 +1,43 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, 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
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+; Module Name:
+;
+;   Monitor.Asm
+;
+; Abstract:
+;
+;   AsmMonitor function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; AsmMonitor (
+;   IN      UINTN                     Eax,
+;   IN      UINTN                     Ecx,
+;   IN      UINTN                     Edx
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmMonitor)
+ASM_PFX(AsmMonitor):
+    mov     eax, ecx
+    mov     ecx, edx
+    mov     edx, r8d
+    DB      0xf, 1, 0xc8                ; monitor
+    ret
+