diff --git a/src/acpi/acpi.c b/src/acpi/acpi.c
index 492d043..f8994eb 100644
--- a/src/acpi/acpi.c
+++ b/src/acpi/acpi.c
@@ -1685,6 +1685,10 @@
 	/* should be 0 ACPI 3.0 */
 	fadt->reserved = 0;
 
+	/* P_LVLx latencies are not used as CPU _CST will override them. */
+	fadt->p_lvl2_lat = ACPI_FADT_C2_NOT_SUPPORTED;
+	fadt->p_lvl3_lat = ACPI_FADT_C3_NOT_SUPPORTED;
+
 	fadt->preferred_pm_profile = acpi_get_preferred_pm_profile();
 
 	if (CONFIG(USE_PC_CMOS_ALTCENTURY))