diff --git a/firmware/Makefile b/firmware/Makefile
index 0ba687f90e..b4c5fad14d 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -166,7 +166,9 @@ include $(CHIBIOS)/os/hal/osal/rt-nil/osal.mk
 include $(CHIBIOS)/os/rt/rt.mk
 include $(CHIBIOS)/os/common/ports/ARMCMx/compilers/GCC/mk/port_v7m.mk
 # EX files (optional).
+ifneq ($(USE_LIS302),no)
 include $(CHIBIOS)/os/ex/devices/ST/lis302dl.mk
+endif
 include $(CHIBIOS)/os/hal/lib/streams/streams.mk
 include $(CHIBIOS)/os/various/cpp_wrappers/chcpp.mk
 
diff --git a/firmware/config/boards/clean_env_variables.sh b/firmware/config/boards/clean_env_variables.sh
index 03b7f5f2cf..8212c942dd 100644
--- a/firmware/config/boards/clean_env_variables.sh
+++ b/firmware/config/boards/clean_env_variables.sh
@@ -11,5 +11,6 @@ export LED_CRITICAL_ERROR_BRAIN_PIN=""
 export BUILDDIR=""
 export DEBUG_LEVEL_OPT=""
 export USE_FATFS=""
+export USE_LIS302=""
 export USE_SMART_BUILD=""
 export SC_BUFFER_SIZE=""