diff --git a/drivers/mtd/tests/oobtest.c b/drivers/mtd/tests/oobtest.c
index 1fd2cdad85f0739ae6e9f73427fc18cc7f8a9252..5e061186eab181c927d41568dd73b7cd9e486b25 100644
--- a/drivers/mtd/tests/oobtest.c
+++ b/drivers/mtd/tests/oobtest.c
@@ -132,7 +132,7 @@ static size_t memcmpshow(loff_t addr, const void *cs, const void *ct, size_t cou
 	for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--, i++) {
 		res = *su1 ^ *su2;
 		if (res) {
-			pr_info("error @addr[0x%lx:0x%x] 0x%x -> 0x%x diff 0x%x\n",
+			pr_info("error @addr[0x%lx:0x%zx] 0x%x -> 0x%x diff 0x%x\n",
 				(unsigned long)addr, i, *su1, *su2, res);
 			bitflips += hweight8(res);
 		}