diff --git a/subsys/modbus/modbus_core.c b/subsys/modbus/modbus_core.c
index 749f14ef08d..c8250d094f9 100644
--- a/subsys/modbus/modbus_core.c
+++ b/subsys/modbus/modbus_core.c
@@ -35,7 +35,7 @@ DT_INST_FOREACH_STATUS_OKAY(MB_RTU_DEFINE_GPIO_CFGS)
 		    (&prop##_cfg_##inst), (NULL))
 
 #define MODBUS_DT_GET_SERIAL_DEV(inst) {			\
-		.dev = DEVICE_DT_GET(DT_INST_BUS(inst)),	\
+		.dev = DEVICE_DT_GET(DT_INST_PARENT(inst)),	\
 		.de = MB_RTU_ASSIGN_GPIO_CFG(inst, de_gpios),	\
 		.re = MB_RTU_ASSIGN_GPIO_CFG(inst, re_gpios),	\
 	},