diff --git a/MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.c b/MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.c
index 3ba7a35096..3542cf6921 100644
--- a/MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.c
+++ b/MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.c
@@ -35,3 +35,18 @@ CpuFlushTlb (
   )
 {
 }
+
+/**
+  Determine if the standard CPU signature is "AuthenticAMD".
+
+  @retval TRUE  The CPU signature matches.
+  @retval FALSE The CPU signature does not match.
+**/
+BOOLEAN
+EFIAPI
+StandardSignatureIsAuthenticAMD (
+  VOID
+  )
+{
+  return FALSE;
+}