diff --git a/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb b/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
index 696e16dbfe..0b69af9f9b 100644
--- a/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
@@ -217,8 +217,8 @@ chip soc/amd/cezanne
 			.tx_vboost_lvl_en=1,
 			.tx_vboost_lvl=5,
 		},
-		.ComboPhyStaticConfig[0] = 0,
-		.ComboPhyStaticConfig[1] = 0,
+		.ComboPhyStaticConfig[0] = USB_COMBO_PHY_MODE_USB_C,
+		.ComboPhyStaticConfig[1] = USB_COMBO_PHY_MODE_USB_C,
 		.BatteryChargerEnable = 0,
 		.PhyP3CpmP4Support = 0,
 	}"
diff --git a/src/mainboard/google/guybrush/variants/nipperkin/overridetree.cb b/src/mainboard/google/guybrush/variants/nipperkin/overridetree.cb
index 85581d2d5a..8270b147bb 100644
--- a/src/mainboard/google/guybrush/variants/nipperkin/overridetree.cb
+++ b/src/mainboard/google/guybrush/variants/nipperkin/overridetree.cb
@@ -154,8 +154,8 @@ chip soc/amd/cezanne
 			.tx_vboost_lvl_en=1,
 			.tx_vboost_lvl=5,
 		},
-		.ComboPhyStaticConfig[0] = 0,
-		.ComboPhyStaticConfig[1] = 0,
+		.ComboPhyStaticConfig[0] = USB_COMBO_PHY_MODE_USB_C,
+		.ComboPhyStaticConfig[1] = USB_COMBO_PHY_MODE_USB_C,
 		.BatteryChargerEnable = 0,
 		.PhyP3CpmP4Support = 0,
 	}"