diff --git a/drivers/media/dvb-frontends/cx24120.c b/drivers/media/dvb-frontends/cx24120.c
index 10a948e..a1d1b1c 100644
--- a/drivers/media/dvb-frontends/cx24120.c
+++ b/drivers/media/dvb-frontends/cx24120.c
@@ -838,7 +838,7 @@
 }
 
 /* Calculate ber window time */
-void cx24120_calculate_ber_window(struct cx24120_state *state, u32 rate)
+static void cx24120_calculate_ber_window(struct cx24120_state *state, u32 rate)
 {
 	struct dvb_frontend *fe = &state->frontend;
 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;