diff --git a/src/mainboard/google/volteer/variants/chronicler/overridetree.cb b/src/mainboard/google/volteer/variants/chronicler/overridetree.cb
index 180acca7b3..483fd3df21 100644
--- a/src/mainboard/google/volteer/variants/chronicler/overridetree.cb
+++ b/src/mainboard/google/volteer/variants/chronicler/overridetree.cb
@@ -272,6 +272,7 @@ chip soc/intel/tigerlake
 			register "PcieRpHotPlug[4]" = "1"
 			register "PcieClkSrcUsage[5]" = "4"
 			register "PcieClkSrcClkReq[5]" = "5"
+			register "PcieRpSlotImplemented[4]" = "false"
 		end
 		device ref pmc hidden
 			# The pmc_mux chip driver is a placeholder for the
diff --git a/src/mainboard/google/volteer/variants/elemi/overridetree.cb b/src/mainboard/google/volteer/variants/elemi/overridetree.cb
index 8f220b8fcd..c63dd738f2 100644
--- a/src/mainboard/google/volteer/variants/elemi/overridetree.cb
+++ b/src/mainboard/google/volteer/variants/elemi/overridetree.cb
@@ -273,6 +273,7 @@ chip soc/intel/tigerlake
 			register "PcieRpHotPlug[4]" = "1"
 			register "PcieClkSrcUsage[5]" = "4"
 			register "PcieClkSrcClkReq[5]" = "5"
+			register "PcieRpSlotImplemented[4]" = "false"
 		end
 		device ref pmc hidden
 			# The pmc_mux chip driver is a placeholder for the