diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
index 335706adf6476192e8faab5de9a9006657a7f03b..2eee6e9a2db2a7c1730b01cc731ae5b6f55fba65 100644
--- a/arch/arm/cpu/armv7/mx6/soc.c
+++ b/arch/arm/cpu/armv7/mx6/soc.c
@@ -101,7 +101,7 @@ void init_aips(void)
  * Possible values are from 0.725V to 1.450V in steps of
  * 0.025V (25mV).
  */
-void set_vddsoc(u32 mv)
+static void set_vddsoc(u32 mv)
 {
 	struct anatop_regs *anatop = (struct anatop_regs *)ANATOP_BASE_ADDR;
 	u32 val, reg = readl(&anatop->reg_core);
diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h b/arch/arm/include/asm/arch-mx6/sys_proto.h
index 8c21364e71b7ca72cff54dd7344da533fe77cdc1..17125a6f3e326c4d2718c98a14ed311cf6a6f8e5 100644
--- a/arch/arm/include/asm/arch-mx6/sys_proto.h
+++ b/arch/arm/include/asm/arch-mx6/sys_proto.h
@@ -29,8 +29,6 @@ u32 get_cpu_rev(void);
 const char *get_imx_type(u32 imxtype);
 unsigned imx_ddr_size(void);
 
-void set_vddsoc(u32 mv);
-
 /*
  * Initializes on-chip ethernet controllers.
  * to override, implement board_eth_init()