diff --git a/UefiCpuPkg/Include/Library/RegisterCpuFeaturesLib.h b/UefiCpuPkg/Include/Library/RegisterCpuFeaturesLib.h
index 8ea060928d..54153f4dae 100644
--- a/UefiCpuPkg/Include/Library/RegisterCpuFeaturesLib.h
+++ b/UefiCpuPkg/Include/Library/RegisterCpuFeaturesLib.h
@@ -35,6 +35,7 @@
 #define CPU_FEATURE_FASTSTRINGS                     6
 #define CPU_FEATURE_VMX                             7
 #define CPU_FEATURE_SMX                             8
+#define CPU_FEATURE_LMCE                            9
 #define CPU_FEATURE_LOCK_FEATURE_CONTROL_REGISTER   10
 #define CPU_FEATURE_LIMIT_CPUID_MAX_VAL             11
 #define CPU_FEATURE_MCE                             12