diff --git a/arch/arm/mach-rk3188/Makefile b/arch/arm/mach-rk3188/Makefile
index 236b2879e418..960db7019c9c 100644
--- a/arch/arm/mach-rk3188/Makefile
+++ b/arch/arm/mach-rk3188/Makefile
@@ -7,6 +7,7 @@ CFLAGS_ddr.o += -mthumb
 obj-y += ../mach-rk30/pmu.o
 obj-y += ../mach-rk30/reset.o
 obj-$(CONFIG_PM) += ../mach-rk30/pm.o
+CFLAGS_pm.o += -mthumb
 endif
 obj-y += ../mach-rk30/common.o
 CFLAGS_common.o += -DTEXT_OFFSET=$(TEXT_OFFSET)