diff --git a/drivers/staging/speakup/spk_ttyio.c b/drivers/staging/speakup/spk_ttyio.c
index 442f191a017e..ed8e96b06ead 100644
--- a/drivers/staging/speakup/spk_ttyio.c
+++ b/drivers/staging/speakup/spk_ttyio.c
@@ -21,7 +21,7 @@ struct spk_ldisc_data {
 static struct spk_synth *spk_ttyio_synth;
 static struct tty_struct *speakup_tty;
 
-int ser_to_dev(int ser, dev_t *dev_no)
+static int ser_to_dev(int ser, dev_t *dev_no)
 {
 	if (ser < 0 || ser > (255 - 64)) {
 		pr_err("speakup: Invalid ser param. Must be between 0 and 191 inclusive.\n");