diff --git a/drivers/hsi/clients/ssi_protocol.c b/drivers/hsi/clients/ssi_protocol.c
index ce4be3738d46..fe364a342717 100644
--- a/drivers/hsi/clients/ssi_protocol.c
+++ b/drivers/hsi/clients/ssi_protocol.c
@@ -901,7 +901,7 @@ out:
 	ssip_free_data(msg);
 }
 
-void ssip_port_event(struct hsi_client *cl, unsigned long event)
+static void ssip_port_event(struct hsi_client *cl, unsigned long event)
 {
 	switch (event) {
 	case HSI_EVENT_START_RX: