diff --git a/firmware/config/boards/s105/board.mk b/firmware/config/boards/s105/board.mk
index 8e362f2c12..b51df8c9b1 100644
--- a/firmware/config/boards/s105/board.mk
+++ b/firmware/config/boards/s105/board.mk
@@ -31,7 +31,7 @@ USE_FATFS = no
 
 # see EFI_CONSOLE_TX_PORT for default PA9/PA10
 # debug console
-DDEFS += -DTS_PRIMARY_UxART_PORT=SD1
+# DDEFS += -DTS_PRIMARY_UxART_PORT=SD1
 DDEFS += -DEFI_CONSOLE_TX_BRAIN_PIN=Gpio::A9 -DEFI_CONSOLE_RX_BRAIN_PIN=Gpio::A10
 
 DDEFS += -DFIRMWARE_ID=\"s105\"