diff --git a/port/posix-h4/main.c b/port/posix-h4/main.c
index 819927579..0110c318a 100644
--- a/port/posix-h4/main.c
+++ b/port/posix-h4/main.c
@@ -196,6 +196,7 @@ static void local_version_information_handler(uint8_t * packet){
         case BLUETOOTH_COMPANY_ID_EM_MICROELECTRONIC_MARIN_SA:
             printf("EM Microelectronics - using EM9301 driver.\n");
             hci_set_chipset(btstack_chipset_em9301_instance());
+            use_fast_uart();
             break;
         case BLUETOOTH_COMPANY_ID_NORDIC_SEMICONDUCTOR_ASA:
             printf("Nordic Semiconductor nRF5 chipset.\n");