diff --git a/src/uart/emsuart_esp32.cpp b/src/uart/emsuart_esp32.cpp
index b14fef8f7..4ce8b405e 100644
--- a/src/uart/emsuart_esp32.cpp
+++ b/src/uart/emsuart_esp32.cpp
@@ -39,7 +39,7 @@ uint32_t             inverse_mask = 0;
 // receive task, wait for break and call incoming_telegram
 void EMSuart::uart_event_task(void * pvParameters) {
     uart_event_t event;
-    uint8_t      telegram[UART_FIFO_LEN + 1]; // same size as in driver_install
+    uint8_t      telegram[UART_HW_FIFO_LEN(EMSUART_NUM) + 1]; // same size as in driver_install
     uint8_t      length = 0;
 
     while (1) {
@@ -92,7 +92,12 @@ void EMSuart::start(const uint8_t tx_mode, const uint8_t rx_gpio, const uint8_t
         uart_param_config(EMSUART_NUM, &uart_config);
         uart_set_pin(EMSUART_NUM, tx_gpio, rx_gpio, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
         uart_set_line_inverse(EMSUART_NUM, inverse_mask);
-        uart_driver_install(EMSUART_NUM, UART_FIFO_LEN + 1, 0, UART_FIFO_LEN + 3, &uart_queue, 0); // buffer must be > fifo, queue can hold data+break+overflow message
+        uart_driver_install(EMSUART_NUM,
+                            UART_HW_FIFO_LEN(EMSUART_NUM) + 1,
+                            0,
+                            UART_HW_FIFO_LEN(EMSUART_NUM) + 3,
+                            &uart_queue,
+                            0); // buffer must be > fifo, queue can hold data+break+overflow message
         uart_set_rx_full_threshold(EMSUART_NUM, 1);
         uart_set_rx_timeout(EMSUART_NUM, 0); // disable