diff --git a/drivers/mtd/mtd_partition.c b/drivers/mtd/mtd_partition.c
index f0f92f46dd8..32d59cfe2c5 100644
--- a/drivers/mtd/mtd_partition.c
+++ b/drivers/mtd/mtd_partition.c
@@ -629,14 +629,15 @@ 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%7d %7d   %s\n",
-                  partname, attr->nextpart->firstblock / blkpererase,
-                  attr->nextpart->neraseblocks,
+          ret = snprintf(&buffer[total], buflen - total, "%s%7ju %ju   %s\n",
+                  partname,
+                  (uintmax_t)attr->nextpart->firstblock / blkpererase,
+                  (uintmax_t)attr->nextpart->neraseblocks,
                   attr->nextpart->parent->name);
 #else
-          ret = snprintf(&buffer[total], buflen - total, "%7d %7d   %s\n",
-                  attr->nextpart->firstblock / blkpererase,
-                  attr->nextpart->neraseblocks,
+          ret = snprintf(&buffer[total], buflen - total, "%7ju %7ju   %s\n",
+                  (uintmax_t)attr->nextpart->firstblock / blkpererase,
+                  (uintmax_t)attr->nextpart->neraseblocks,
                   attr->nextpart->parent->name);
 #endif