diff --git a/firmware/src_simtrace/card_emu.h b/firmware/src_simtrace/card_emu.h
index eea3478..95d2bae 100644
--- a/firmware/src_simtrace/card_emu.h
+++ b/firmware/src_simtrace/card_emu.h
@@ -26,6 +26,7 @@
 
 struct llist_head *card_emu_get_uart_tx_queue(struct card_handle *ch);
 struct llist_head *card_emu_get_usb_tx_queue(struct card_handle *ch);
+void card_emu_have_new_uart_tx(struct card_handle *ch);
 
 #define ENABLE_TX	0x01
 #define ENABLE_RX	0x02