diff --git a/usr.bin/fstat/fstat.c b/usr.bin/fstat/fstat.c
index 53561e88e033..f82e964395b2 100644
--- a/usr.bin/fstat/fstat.c
+++ b/usr.bin/fstat/fstat.c
@@ -658,7 +658,7 @@ devfs_filestat(struct vnode *vp, struct filestat *fsp)
 		    (void *)devfs_dirent.de_vnode, Pid);
 		return 0;
 	}
-	fsp->fsid = (long)mount.mnt_stat.f_fsid.val[0];
+	fsp->fsid = (long)(uint32_t)mount.mnt_stat.f_fsid.val[0];
 	fsp->fileid = devfs_dirent.de_inode;
 	fsp->mode = (devfs_dirent.de_mode & ~S_IFMT) | S_IFCHR;
 	fsp->size = 0;
diff --git a/usr.bin/fstat/zfs.c b/usr.bin/fstat/zfs.c
index 008f1746b0ba..96cdff6870a0 100644
--- a/usr.bin/fstat/zfs.c
+++ b/usr.bin/fstat/zfs.c
@@ -117,7 +117,7 @@ zfs_filestat(struct vnode *vp, struct filestat *fsp)
 		goto bad;
 	}
 
-	fsp->fsid = (long)mount.mnt_stat.f_fsid.val[0];
+	fsp->fsid = (long)(uint32_t)mount.mnt_stat.f_fsid.val[0];
 	fsp->fileid = *zid;
 	/*
 	 * XXX: Shows up wrong in output, but UFS has this error too. Could