diff --git a/commands/nand.c b/commands/nand.c
index 34aa07b..6124dae 100644
--- a/commands/nand.c
+++ b/commands/nand.c
@@ -79,6 +79,7 @@
 	if (command & NAND_MARKBAD) {
 		if (optind < argc) {
 			int ret = 0, fd;
+			loff_t __badblock = badblock;
 
 			printf("marking block at 0x%08x on %s as bad\n", badblock, argv[optind]);
 
@@ -88,7 +89,7 @@
 				return 1;
 			}
 
-			ret = ioctl(fd, MEMSETBADBLOCK, (void *)badblock);
+			ret = ioctl(fd, MEMSETBADBLOCK, &__badblock);
 			if (ret)
 				perror("ioctl");
 
diff --git a/commands/nandtest.c b/commands/nandtest.c
index d923e42..06b7f94 100644
--- a/commands/nandtest.c
+++ b/commands/nandtest.c
@@ -307,11 +307,11 @@
 		for (test_ofs = flash_offset;
 				test_ofs < flash_offset+length;
 				test_ofs += meminfo.erasesize) {
-
+			loff_t __test_ofs = test_ofs;
 			srand(seed);
 			seed = rand();
 
-			if (ioctl(fd, MEMGETBADBLOCK, (void *)test_ofs)) {
+			if (ioctl(fd, MEMGETBADBLOCK, &__test_ofs)) {
 				printf("\rBad block at 0x%08x\n",
 						(unsigned)(test_ofs +
 							memregion.offset));
diff --git a/drivers/mtd/nand/nand-bb.c b/drivers/mtd/nand/nand-bb.c
index d272749..5b06a9e 100644
--- a/drivers/mtd/nand/nand-bb.c
+++ b/drivers/mtd/nand/nand-bb.c
@@ -216,7 +216,7 @@
 static loff_t nand_bb_lseek(struct cdev *cdev, loff_t __offset)
 {
 	struct nand_bb *bb = cdev->priv;
-	unsigned long raw_pos = 0;
+	loff_t raw_pos = 0;
 	uint32_t offset = __offset;
 	int ret;
 
@@ -226,7 +226,7 @@
 	while (raw_pos < bb->raw_size) {
 		off_t now = min(offset, bb->info.erasesize);
 
-		ret = cdev_ioctl(bb->cdev_parent, MEMGETBADBLOCK, (void *)raw_pos);
+		ret = cdev_ioctl(bb->cdev_parent, MEMGETBADBLOCK, &raw_pos);
 		if (ret < 0)
 			return ret;
 		if (!ret) {