diff --git a/arch/arm/plat-rk/Makefile b/arch/arm/plat-rk/Makefile
index bc9832edc8e0..acd4bff21f16 100644
--- a/arch/arm/plat-rk/Makefile
+++ b/arch/arm/plat-rk/Makefile
@@ -7,4 +7,5 @@ obj-$(CONFIG_FIQ_DEBUGGER) += rk_fiq_debugger.o
 obj-$(CONFIG_RK_EARLY_PRINTK) += early_printk.o ../kernel/debug.o
 obj-y += mem_reserve.o
 obj-y += sram.o
+CFLAGS_sram.o += -Os -mthumb
 obj-$(CONFIG_DDR_TEST) += memtester.o