diff --git a/firmware/config/boards/proteus/board.mk b/firmware/config/boards/proteus/board.mk
index 27f8497f2a..c8e0afa03b 100644
--- a/firmware/config/boards/proteus/board.mk
+++ b/firmware/config/boards/proteus/board.mk
@@ -22,6 +22,8 @@ DDEFS += -DEFI_MAIN_RELAY_CONTROL=TRUE
 DDEFS += -DEFI_ICU_INPUTS=FALSE -DHAL_TRIGGER_USE_PAL=TRUE
 DDEFS += -DEFI_LOGIC_ANALYZER=FALSE
 
+DDEFS += -DEFI_CAN_SERIAL=TRUE
+
 # This stuff doesn't work on H7 yet
 ifneq ($(PROJECT_CPU),ARCH_STM32H7)
 	DDEFS += -DSTM32_ADC_USE_ADC3=TRUE