diff --git a/firmware/config/boards/hellen/hellen-honda-k/board.mk b/firmware/config/boards/hellen/hellen-honda-k/board.mk
index 108d5a5024..f27db3f3f1 100644
--- a/firmware/config/boards/hellen/hellen-honda-k/board.mk
+++ b/firmware/config/boards/hellen/hellen-honda-k/board.mk
@@ -10,6 +10,7 @@ endif
 DDEFS += -DEFI_MAIN_RELAY_CONTROL=TRUE
 
 DDEFS += -DEFI_KLINE=TRUE
+DDEFS += -DSTM32_SERIAL_USE_USART2=TRUE
 
 DDEFS += -DADC_MUX_PIN=Gpio::F2