diff --git a/app/src/studio/uart_rpc_interface.c b/app/src/studio/uart_rpc_interface.c
index 21bc3bebf403..cd05b55af9de 100644
--- a/app/src/studio/uart_rpc_interface.c
+++ b/app/src/studio/uart_rpc_interface.c
@@ -111,7 +111,7 @@ static void serial_cb(const struct device *dev, void *user_data) {
 static int uart_rpc_interface_init(void) {
     if (!device_is_ready(uart_dev)) {
         LOG_ERR("UART device not found!");
-        return 0;
+        return -ENODEV;
     }
 
     /* configure interrupt and callback to receive data */