diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index e2ea8fff66..28d4a966c2 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -2062,6 +2062,15 @@
   # @Prompt Enable control flow enforcement.
   gEfiMdePkgTokenSpaceGuid.PcdControlFlowEnforcementPropertyMask|0x0|UINT32|0x30001017
 
+  ## Indicates the type of instruction sequence to use for a speculation
+  #  barrier.  The default instruction sequence is LFENCE.<BR><BR>
+  #   0x00 - No operation.<BR>
+  #   0x01 - LFENCE (IA32/X64).<BR>
+  #   0x02 - CPUID  (IA32/X64).<BR>
+  #   Other - reserved
+  # @Prompt Speculation Barrier Type.
+  gEfiMdePkgTokenSpaceGuid.PcdSpeculationBarrierType|0x01|UINT8|0x30001018
+
 [PcdsFixedAtBuild,PcdsPatchableInModule]
   ## Indicates the maximum length of unicode string used in the following
   #  BaseLib functions: StrLen(), StrSize(), StrCmp(), StrnCmp(), StrCpy(), StrnCpy()<BR><BR>
diff --git a/MdePkg/MdePkg.uni b/MdePkg/MdePkg.uni
index c359bb4b5b..5c1fa24065 100644
--- a/MdePkg/MdePkg.uni
+++ b/MdePkg/MdePkg.uni
@@ -149,6 +149,14 @@
                                                                                                   " BIT0 - SMM CET Shadow Stack is enabled.<BR>\n"
                                                                                                   " Other - reserved"
 
+#string STR_gEfiMdePkgTokenSpaceGuid_PcdSpeculationBarrierType_PROMPT  #language en-US "Speculation Barrier Type."
+
+#string STR_gEfiMdePkgTokenSpaceGuid_PcdSpeculationBarrierType_HELP  #language en-US  "Indicates the type of instruction sequence to use for a speculation.barrier.  The default instruction sequence is LFENCE.<BR><BR>\n"
+                                                                                      "0x00 - No operation.<BR>\n"
+                                                                                      "0x01 - LFENCE (IA32/X64).<BR>\n"
+                                                                                      "0x02 - CPUID  (IA32/X64).<BR>\n"
+                                                                                      "Other - reserved"
+
 #string STR_gEfiMdePkgTokenSpaceGuid_PcdMaximumAsciiStringLength_PROMPT  #language en-US "Maximum Length of Ascii String"
 
 #string STR_gEfiMdePkgTokenSpaceGuid_PcdMaximumAsciiStringLength_HELP  #language en-US "Sets the maximum number of ASCII characters used for string functions.  This affects the following BaseLib functions: AsciiStrLen(), AsciiStrSize(), AsciiStrCmp(), AsciiStrnCmp(), AsciiStrCpy(), AsciiStrnCpy(). <BR><BR>\n"