diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 346f049..b51954d 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -325,7 +325,7 @@
 }
 
 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
-struct acpi_table_header *acpi_find_dsdt_initrd(void)
+static struct acpi_table_header *acpi_find_dsdt_initrd(void)
 {
 	struct file *firmware_file;
 	mm_segment_t oldfs;