diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index 143ed8e..62a0da4 100644
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -15,7 +15,7 @@
 
 ifndef CONFIG_64BIT
 LDFLAGS		:= -m elf_s390
-CFLAGS		+= -m31
+KBUILD_CFLAGS	+= -m31
 AFLAGS		+= -m31
 UTS_MACHINE	:= s390
 STACK_SIZE	:= 8192
@@ -23,7 +23,7 @@
 else
 LDFLAGS		:= -m elf64_s390
 MODFLAGS	+= -fpic -D__PIC__
-CFLAGS		+= -m64
+KBUILD_CFLAGS	+= -m64
 AFLAGS		+= -m64
 UTS_MACHINE	:= s390x
 STACK_SIZE	:= 16384
@@ -77,8 +77,8 @@
 cflags-$(CONFIG_WARN_STACK) += -mwarn-framesize=$(CONFIG_WARN_STACK_SIZE)
 endif
 
-CFLAGS		+= -mbackchain -msoft-float $(cflags-y)
-CFLAGS 		+= -pipe -fno-strength-reduce -Wno-sign-compare 
+KBUILD_CFLAGS	+= -mbackchain -msoft-float $(cflags-y)
+KBUILD_CFLAGS	+= -pipe -fno-strength-reduce -Wno-sign-compare
 AFLAGS		+= $(aflags-y)
 
 OBJCOPYFLAGS	:= -O binary