diff --git a/src/mainboard/google/brya/variants/mithrax/overridetree.cb b/src/mainboard/google/brya/variants/mithrax/overridetree.cb
index 15bebe2a1a..6a85edf658 100644
--- a/src/mainboard/google/brya/variants/mithrax/overridetree.cb
+++ b/src/mainboard/google/brya/variants/mithrax/overridetree.cb
@@ -218,6 +218,15 @@ chip soc/intel/alderlake
 				device generic 0 on end
 			end
 		end	#PCIE8 SD card
+		device ref pcie_rp9 on
+			chip soc/intel/common/block/pcie/rtd3
+				register "is_storage" = "true"
+				register "enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_D11)"
+				register "reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_B4)"
+				register "srcclk_pin" = "1"
+				device generic 0 on end
+			end
+		end	#PCIE9-12 SSD
 		device ref i2c0 on
 			chip drivers/i2c/generic
 				register "hid" = ""RTL5682""