diff --git a/firmware/config/boards/microrusefi/board.mk b/firmware/config/boards/microrusefi/board.mk
index a79d58ce0d..74c9366bfa 100644
--- a/firmware/config/boards/microrusefi/board.mk
+++ b/firmware/config/boards/microrusefi/board.mk
@@ -23,7 +23,7 @@ EFI_CONSOLE_TTL_PINS = -DEFI_CONSOLE_TX_BRAIN_PIN=Gpio::B10 -DEFI_CONSOLE_RX_BRA
 
 # on MRE 0.6.0 we have SD card on SPI2 which shared channel 3 with USART3
 # todo: enable serial which would not DMA thus not conflict?
-DDEFS += -DSTM32_UART_USE_USART3=FALSE
+DDEFS += -DSTM32_UART_USE_USART3=FALSE -DHAL_USE_UART=FALSE
 
 DDEFS += -DEFI_CAN_SERIAL=TRUE