diff --git a/common/cmd_nand.c b/common/cmd_nand.c
index 3d434e8..aedf8a6 100644
--- a/common/cmd_nand.c
+++ b/common/cmd_nand.c
@@ -160,7 +160,7 @@
 	if (*size == nand->size)
 		puts("whole chip\n");
 	else
-		printf("offset 0x%lx, size 0x%x\n", *off, *size);
+		printf("offset 0x%lx, size 0x%zx\n", *off, *size);
 	return 0;
 }
 
@@ -398,7 +398,7 @@
 			return 1;
 		}
 
-		printf(" %d bytes %s: %s\n", size,
+		printf(" %zu bytes %s: %s\n", size,
 		       read ? "read" : "written", ret ? "ERROR" : "OK");
 
 		return ret == 0 ? 0 : 1;
diff --git a/drivers/mtd/nand/nand_util.c b/drivers/mtd/nand/nand_util.c
index 77da53e..6ba52b3 100644
--- a/drivers/mtd/nand/nand_util.c
+++ b/drivers/mtd/nand/nand_util.c
@@ -495,7 +495,7 @@
 	if (len_incl_bad == *length) {
 		rval = nand_write (nand, offset, length, buffer);
 		if (rval != 0)
-			printf ("NAND write to offset %x failed %d\n",
+			printf ("NAND write to offset %zx failed %d\n",
 				offset, rval);
 
 		return rval;
@@ -506,7 +506,7 @@
 		size_t write_size;
 
 		if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {
-			printf ("Skip bad block 0x%08x\n",
+			printf ("Skip bad block 0x%08zx\n",
 				offset & ~(nand->erasesize - 1));
 			offset += nand->erasesize - block_offset;
 			continue;
@@ -519,7 +519,7 @@
 
 		rval = nand_write (nand, offset, &write_size, p_buffer);
 		if (rval != 0) {
-			printf ("NAND write to offset %x failed %d\n",
+			printf ("NAND write to offset %zx failed %d\n",
 				offset, rval);
 			*length -= left_to_write;
 			return rval;
@@ -565,7 +565,7 @@
 	if (len_incl_bad == *length) {
 		rval = nand_read (nand, offset, length, buffer);
 		if (rval != 0)
-			printf ("NAND read from offset %x failed %d\n",
+			printf ("NAND read from offset %zx failed %d\n",
 				offset, rval);
 
 		return rval;
@@ -576,7 +576,7 @@
 		size_t read_length;
 
 		if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {
-			printf ("Skipping bad block 0x%08x\n",
+			printf ("Skipping bad block 0x%08zx\n",
 				offset & ~(nand->erasesize - 1));
 			offset += nand->erasesize - block_offset;
 			continue;
@@ -589,7 +589,7 @@
 
 		rval = nand_read (nand, offset, &read_length, p_buffer);
 		if (rval != 0) {
-			printf ("NAND read from offset %x failed %d\n",
+			printf ("NAND read from offset %zx failed %d\n",
 				offset, rval);
 			*length -= left_to_read;
 			return rval;