diff --git a/src/cpu/intel/haswell/finalize.c b/src/cpu/intel/haswell/finalize.c
index 1f84b821a9..1832e63967 100644
--- a/src/cpu/intel/haswell/finalize.c
+++ b/src/cpu/intel/haswell/finalize.c
@@ -6,4 +6,6 @@
 
 void intel_cpu_haswell_finalize_smm(void)
 {
+	/* Lock memory configuration to protect SMM */
+	msr_set_bit(MSR_LT_LOCK_MEMORY, 0);
 }