diff --git a/main.c b/main.c
index 61bfa2d..4ddd245 100644
--- a/main.c
+++ b/main.c
@@ -105,7 +105,8 @@ sd_card_t* sd_get_by_num(size_t num) {
 /*------------- MAIN -------------*/
 int main(void) {
   board_init();
-
+  gpio_set_function(12, UART_FUNCSEL_NUM(uart0, 12));
+  gpio_set_function(13, UART_FUNCSEL_NUM(uart0, 13));
   printf("TinyUSB Host CDC MSC HID Example - test comparatif\r\n");
 
   // init host stack on configured roothub port