diff --git a/builddefs/common_rules.mk b/builddefs/common_rules.mk
index d8e0bf0220..282cc6c656 100644
--- a/builddefs/common_rules.mk
+++ b/builddefs/common_rules.mk
@@ -76,6 +76,8 @@ else
 endif
 CFLAGS += -Wall
 CFLAGS += -Wstrict-prototypes
+CFLAGS += $(call cc-option,-Wunused-but-set-variable=1,-Wunused-but-set-variable)
+CFLAGS += $(call cc-option,-Wunused-but-set-parameter=1,-Wunused-but-set-parameter)
 ifneq ($(strip $(ALLOW_WARNINGS)), yes)
     CFLAGS += -Werror
 endif
@@ -93,7 +95,8 @@ CXXFLAGS += -O$(OPT)
 CXXFLAGS += -w
 CXXFLAGS += -Wall
 CXXFLAGS += -Wundef
-
+CXXFLAGS += $(call cc-option,-Wunused-but-set-variable=1,-Wunused-but-set-variable)
+CXXFLAGS += $(call cc-option,-Wunused-but-set-parameter=1,-Wunused-but-set-parameter)
 ifneq ($(strip $(ALLOW_WARNINGS)), yes)
     CXXFLAGS += -Werror
 endif