diff --git a/src/mainboard/ocp/deltalake/devicetree.cb b/src/mainboard/ocp/deltalake/devicetree.cb
index 8b6e3aea6c..70dd6d683b 100644
--- a/src/mainboard/ocp/deltalake/devicetree.cb
+++ b/src/mainboard/ocp/deltalake/devicetree.cb
@@ -46,6 +46,8 @@ chip soc/intel/xeon_sp/cpx
 		.PortLinkSpeed = PcieAuto,
 	}"
 
+	register "cstate_states" = "CSTATES_C1C6"
+
 	device cpu_cluster 0 on
 	  device lapic 0 on end
 	end