diff --git a/arch/arm/mach-rk2928/Makefile b/arch/arm/mach-rk2928/Makefile
index 96b8d68a4d82..6be4f090ad10 100755
--- a/arch/arm/mach-rk2928/Makefile
+++ b/arch/arm/mach-rk2928/Makefile
@@ -11,7 +11,6 @@ obj-y += ddr.o
 obj-$(CONFIG_CPU_FREQ) += cpufreq.o
 obj-$(CONFIG_DVFS) += dvfs.o
 obj-$(CONFIG_PM) += pm.o
-CFLAGS_pm.o += -Os -mthumb
 obj-$(CONFIG_RK30_I2C_INSRAM) += i2c_sram.o
 
 board-y := board-rk2928.o