diff --git a/software/sys_controller/Makefile b/software/sys_controller/Makefile
index f8ceeec..19acab7 100644
--- a/software/sys_controller/Makefile
+++ b/software/sys_controller/Makefile
@@ -196,7 +196,7 @@ APP_CFLAGS_UNDEFINED_SYMBOLS :=
 APP_CFLAGS_OPTIMIZATION := -Os
 APP_CFLAGS_DEBUG_LEVEL :=
 APP_CFLAGS_WARNINGS := -Wall -Wno-unused-but-set-variable -Wno-unused-variable -Wno-unused-function -Wno-packed-bitfield-compat
-APP_CFLAGS_USER_FLAGS := -fdata-sections -ffunction-sections -fshort-enums -fgnu89-inline
+APP_CFLAGS_USER_FLAGS := -fdata-sections -ffunction-sections -fshort-enums -fgnu89-inline -flto
 
 APP_ASFLAGS_USER :=
 APP_LDFLAGS_USER := -Wl,--gc-sections