diff --git a/arch/arm/mach-shmobile/setup-r8a7778.c b/arch/arm/mach-shmobile/setup-r8a7778.c
index f5e15c926fef..468ee6551184 100644
--- a/arch/arm/mach-shmobile/setup-r8a7778.c
+++ b/arch/arm/mach-shmobile/setup-r8a7778.c
@@ -258,7 +258,7 @@ static struct resource hspi_resources[] __initdata = {
 	DEFINE_RES_IRQ(gic_iid(0x75)),
 };
 
-void __init r8a7778_register_hspi(int id)
+static void __init r8a7778_register_hspi(int id)
 {
 	BUG_ON(id < 0 || id > 2);