diff --git a/firmware/rusefi_rules.mk b/firmware/rusefi_rules.mk
index 26d6a83bf3..c3dc042ce4 100644
--- a/firmware/rusefi_rules.mk
+++ b/firmware/rusefi_rules.mk
@@ -6,6 +6,5 @@ ifneq ($(ALLOW_SHADOW),yes)
 endif
 
 # ...except these few
-RUSEFI_OPT += -Wno-error=unused-function
 RUSEFI_OPT += -Wno-error=sign-compare
 RUSEFI_OPT += -Wno-error=unused-parameter