diff --git a/arch/arm/mach-uniphier/boot-mode/boot-mode-proxstream2.c b/arch/arm/mach-uniphier/boot-mode/boot-mode-proxstream2.c
index de12953585..3769ec555b 100644
--- a/arch/arm/mach-uniphier/boot-mode/boot-mode-proxstream2.c
+++ b/arch/arm/mach-uniphier/boot-mode/boot-mode-proxstream2.c
@@ -46,7 +46,7 @@ static struct boot_device_info boot_device_table[] = {
 	{BOOT_DEVICE_NONE, "Reserved"},
 };
 
-int get_boot_mode_sel(void)
+static int get_boot_mode_sel(void)
 {
 	return (readl(SG_PINMON0) >> 1) & 0x1f;
 }