diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index d1f6029b2b..d064ac3048 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -207,7 +207,7 @@ int mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts,
 {
 	struct mtd_partition partition = {}, *parts;
 	const char *mtdparts = *_mtdparts;
-	int cur_off = 0, cur_sz = 0;
+	uint64_t cur_off = 0, cur_sz = 0;
 	int nparts = 0;
 	int ret, idx;
 	u64 sz;