diff --git a/src/mainboard/siemens/mc_rpl/variants/mc_rpl1/overridetree.cb b/src/mainboard/siemens/mc_rpl/variants/mc_rpl1/overridetree.cb
index 3c26345eae..ae9f1c0ab4 100644
--- a/src/mainboard/siemens/mc_rpl/variants/mc_rpl1/overridetree.cb
+++ b/src/mainboard/siemens/mc_rpl/variants/mc_rpl1/overridetree.cb
@@ -75,6 +75,7 @@ chip soc/intel/alderlake
 			register "cpu_pcie_rp[CPU_RP(1)]" = "{
 				.clk_src = 0,
 				.flags = PCIE_RP_CLK_REQ_UNUSED,
+				.pcie_rp_pcie_speed = SPEED_GEN2,
 			}"
 		end
 		device ref pcie4_1 on