diff --git a/arch/sh/cchips/hd6446x/Makefile b/arch/sh/cchips/hd6446x/Makefile
index 9682e3ab668f..59c348337bb8 100644
--- a/arch/sh/cchips/hd6446x/Makefile
+++ b/arch/sh/cchips/hd6446x/Makefile
@@ -1,3 +1,3 @@
 obj-$(CONFIG_HD64461)	+= hd64461.o
 
-EXTRA_CFLAGS += -Werror
+ccflags-y := -Werror
diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile
index 1086ba1abdab..a1effb673722 100644
--- a/arch/sh/kernel/Makefile
+++ b/arch/sh/kernel/Makefile
@@ -44,4 +44,4 @@ obj-$(CONFIG_HAS_IOPORT)	+= io_generic.o
 obj-$(CONFIG_HAVE_HW_BREAKPOINT)		+= hw_breakpoint.o
 obj-$(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)	+= localtimer.o
 
-EXTRA_CFLAGS += -Werror
+ccflags-y := -Werror
diff --git a/arch/sh/lib/Makefile b/arch/sh/lib/Makefile
index dab4d2129812..7b95f29e3174 100644
--- a/arch/sh/lib/Makefile
+++ b/arch/sh/lib/Makefile
@@ -30,4 +30,4 @@ lib-$(CONFIG_MMU)		+= copy_page.o __clear_user.o
 lib-$(CONFIG_MCOUNT)		+= mcount.o
 lib-y				+= $(memcpy-y) $(memset-y) $(udivsi3-y)
 
-EXTRA_CFLAGS += -Werror
+ccflags-y := -Werror
diff --git a/arch/sh/mm/Makefile b/arch/sh/mm/Makefile
index 53f7c684afb2..939663c55911 100644
--- a/arch/sh/mm/Makefile
+++ b/arch/sh/mm/Makefile
@@ -66,4 +66,4 @@ CFLAGS_fault_64.o += -ffixed-r7 \
 	-ffixed-r60 -ffixed-r61 -ffixed-r62 \
 	-fomit-frame-pointer
 
-EXTRA_CFLAGS += -Werror
+ccflags-y := -Werror