diff --git a/drivers/mmc/host/sdhci-bcm-kona.c b/drivers/mmc/host/sdhci-bcm-kona.c
index bca6d5597bea..fe27d25ff24b 100644
--- a/drivers/mmc/host/sdhci-bcm-kona.c
+++ b/drivers/mmc/host/sdhci-bcm-kona.c
@@ -161,7 +161,7 @@ static int sdhci_bcm_kona_sd_card_emulate(struct sdhci_host *host, int insert)
 /*
  * SD card interrupt event callback
  */
-void sdhci_bcm_kona_card_event(struct sdhci_host *host)
+static void sdhci_bcm_kona_card_event(struct sdhci_host *host)
 {
 	if (mmc_gpio_get_cd(host->mmc) > 0) {
 		dev_dbg(mmc_dev(host->mmc),