--- ./mkfs/proto.c.orig	2025-02-13 03:54:09.000000000 -0600
+++ ./mkfs/proto.c	2025-02-18 14:18:38.277993741 -0600
@@ -20,7 +20,7 @@
 static void rsvfile(xfs_mount_t *mp, xfs_inode_t *ip, long long len);
 static int newregfile(char **pp, char **fname);
 static void rtinit(xfs_mount_t *mp);
-static long filesize(int fd);
+static off_t filesize(int fd);
 static int slashes_are_spaces;
 
 /*