diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl4/devicetree.cb b/src/mainboard/siemens/mc_ehl/variants/mc_ehl4/devicetree.cb
index 56cfc3bc03..e99dd48f06 100644
--- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl4/devicetree.cb
+++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl4/devicetree.cb
@@ -78,6 +78,9 @@ chip soc/intel/elkhartlake
 	register "PcieRpPcieSpeed[3]" = "1"
 	register "PcieRpPcieSpeed[4]" = "1"
 
+	register "PcieRpMaxPayload[1]" = "RpMaxPayload_256"
+	register "PcieRpMaxPayload[2]" = "RpMaxPayload_256"
+
 	# Storage (SATA/SDCARD/EMMC) related UPDs
 	register "SataSalpSupport" = "0"
 	register "SataPortsEnable[0]" = "1"