diff --git a/firmware/config/boards/hellen/alphax-4chan/board.mk b/firmware/config/boards/hellen/alphax-4chan/board.mk
index e6dff32055..7c9026c37e 100644
--- a/firmware/config/boards/hellen/alphax-4chan/board.mk
+++ b/firmware/config/boards/hellen/alphax-4chan/board.mk
@@ -22,7 +22,6 @@ ifeq ($(PROJECT_CPU),ARCH_STM32F7)
 	DDEFS += -DSHORT_BOARD_NAME=alphax-4chan-f7
 	# TODO: why do I struggle to fit into flash? compare with Proteus
 	DDEFS += -DCH_DBG_ENABLE_ASSERTS=FALSE
-    DDEFS += $(PRIMARY_COMMUNICATION_PORT_USART2)
 else ifeq ($(PROJECT_CPU),ARCH_STM32F4)
 	DDEFS += -DSHORT_BOARD_NAME=alphax-4chan
 	# This board has trigger scope hardware!