diff --git a/arch/arm/mach-rk29/include/mach/pm-vol.h b/arch/arm/mach-rk29/include/mach/pm-vol.h
index b265f656c6af..70d78c78374f 100644
--- a/arch/arm/mach-rk29/include/mach/pm-vol.h
+++ b/arch/arm/mach-rk29/include/mach/pm-vol.h
@@ -11,9 +11,7 @@ void __sramfunc rk29_suspend_voltage_resume(unsigned int vol);
 #else
 
 #define interface_ctr_reg_pread()
-static unsigned int __sramfunc rk29_suspend_voltage_set(unsigned int vol)
-{
-}
+static unsigned int __sramfunc rk29_suspend_voltage_set(unsigned int vol) { return 0; }
 #define rk29_suspend_voltage_resume(a)
 
 #endif