diff --git a/firmware/bootloader/src/Makefile b/firmware/bootloader/src/Makefile
index c3e227546c..ea207c789c 100644
--- a/firmware/bootloader/src/Makefile
+++ b/firmware/bootloader/src/Makefile
@@ -161,6 +161,7 @@ include $(PROJECT_DIR)/hw_layer/drivers/drivers.mk
 # C sources that can be compiled in ARM or THUMB mode depending on the global
 # setting.
 CSRC =  $(ALLCSRC) \
+	$(BOARDSRC) \
 	$(CHIBIOS)/os/various/syscalls.c \
 	$(CONSOLESRC) \
 	$(DEV_SRC) \
diff --git a/firmware/config/boards/hellen/cypress/board.mk b/firmware/config/boards/hellen/cypress/board.mk
index aa3c4c89e0..394c9939a6 100644
--- a/firmware/config/boards/hellen/cypress/board.mk
+++ b/firmware/config/boards/hellen/cypress/board.mk
@@ -26,5 +26,4 @@ LDSCRIPT= $(STARTUPLD_CYPRESS)/cypress_S6E2CxAH.ld
 #PLATFORMINC += $(PLATFORMINC_CONTRIB)
 
 # Shared variables
-ALLCSRC   += $(BOARDSRC)
 ALLINC    += $(BOARDINC)