diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 57f4748..b51e744 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -83,7 +83,7 @@
 static int mmc_device_state(void)
 {
 	int retries = MMC_DEFAULT_MAX_RETRIES;
-	unsigned int resp_data[4];
+	unsigned int resp_data[4] = {0};
 
 	do {
 		int ret;