diff --git a/drivers/ata/pata_ns87415.c b/drivers/ata/pata_ns87415.c
index 4b2ba813dcab..491853b9f085 100644
--- a/drivers/ata/pata_ns87415.c
+++ b/drivers/ata/pata_ns87415.c
@@ -261,7 +261,7 @@ static u8 ns87560_check_status(struct ata_port *ap)
  *	LOCKING:
  *	Inherited from caller.
  */
-void ns87560_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+static void ns87560_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
 {
 	struct ata_ioports *ioaddr = &ap->ioaddr;