--- a/drivers/mtd/devices/ubi32-m25p80.c
+++ b/drivers/mtd/devices/ubi32-m25p80.c
@@ -630,8 +630,8 @@ static int ubicom32_flash_driver_erase(s
 	/* sanity checks */
 	if (instr->addr + instr->len > flash->mtd.size)
 		return -EINVAL;
-	if ((instr->addr % mtd->erasesize) != 0
-			|| (instr->len % mtd->erasesize) != 0) {
+	if (((u32) instr->addr % mtd->erasesize) != 0
+			|| ((u32) instr->len % mtd->erasesize) != 0) {
 		return -EINVAL;
 	}
 
