diff --git a/components/drivers/sdio/dev_sdhci.c b/components/drivers/sdio/dev_sdhci.c
index c8fd0646fa2..a07f64a615f 100755
--- a/components/drivers/sdio/dev_sdhci.c
+++ b/components/drivers/sdio/dev_sdhci.c
@@ -3535,7 +3535,7 @@ static void sdhci_reinit(struct rt_sdhci_host *host)
 int rt_sdhci_init_host(struct rt_sdhci_host *host)
 {
     int ret, len;
-    char dev_name[32];
+    char dev_name[RT_NAME_MAX];
     struct rt_mmc_host *mmc = host->mmc;
 
     len = sdio_host_set_name(&mmc->rthost, dev_name);