diff --git a/drivers/mtd/mtd_partition.c b/drivers/mtd/mtd_partition.c
index 8321fc6a40e..61b4fe47092 100644
--- a/drivers/mtd/mtd_partition.c
+++ b/drivers/mtd/mtd_partition.c
@@ -632,7 +632,8 @@ static ssize_t part_procfs_read(FAR struct file *filep, FAR char *buffer,
 
           /* Terminate the partition name and add to output buffer */
 
-          ret = snprintf(&buffer[total], buflen - total, "%s%7ju %ju   %s\n",
+          ret = snprintf(&buffer[total], buflen - total,
+                  "%s%7ju %7ju   %s\n",
                   partname,
                   (uintmax_t)attr->nextpart->firstblock / blkpererase,
                   (uintmax_t)attr->nextpart->neraseblocks,