diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index c9c3d20b784b669bf130cffb716b8525470738fa..a1b820fcb2a6ff60093011d696761ba4ca15e584 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -208,6 +208,8 @@ static ssize_t power_ro_lock_show(struct device *dev,
 
 	ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 
+	mmc_blk_put(md);
+
 	return ret;
 }