diff --git a/exfat/dump/main.c b/exfat/dump/main.c
index b6e0409..3ed3d8f 100644
--- a/exfat/dump/main.c
+++ b/exfat/dump/main.c
@@ -106,7 +106,7 @@
 
 static void dump_sectors(struct exfat* ef)
 {
-	off_t a = 0, b = 0;
+	loff_t a = 0, b = 0;
 
 	printf("Used sectors ");
 	while (exfat_find_used_sectors(ef, &a, &b) == 0)