diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 15e602377655349d22423c82afe62f33623c2929..346f0494dbbb0a53242a6924d8c2f200e631dff2 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -419,7 +419,7 @@ acpi_os_table_override(struct acpi_table_header * existing_table,
 }
 
 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
-int __init acpi_no_initrd_override_setup(char *s)
+static int __init acpi_no_initrd_override_setup(char *s)
 {
 	acpi_no_initrd_override = 1;
 	return 1;