diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index a2342ddc62e7..7f1cb6e5dccb 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -1030,7 +1030,7 @@ int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
 	size_t len = ops->ooblen;
 	u_char *buf = ops->oobbuf;
 
-	DEBUG(MTD_DEBUG_LEVEL3, "onenand_bbt_read_oob: from = 0x%08x, len = %i\n", (unsigned int) from, len);
+	DEBUG(MTD_DEBUG_LEVEL3, "onenand_bbt_read_oob: from = 0x%08x, len = %zi\n", (unsigned int) from, len);
 
 	/* Initialize return value */
 	ops->oobretlen = 0;