diff --git a/usr.bin/fstat/fstat.c b/usr.bin/fstat/fstat.c
index 9d057e516769..f87021073b63 100644
--- a/usr.bin/fstat/fstat.c
+++ b/usr.bin/fstat/fstat.c
@@ -47,6 +47,7 @@ __FBSDID("$FreeBSD$");
 #include <libprocstat.h>
 #include <limits.h>
 #include <pwd.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stddef.h>
@@ -452,7 +453,7 @@ print_vnode_info(struct procstat *procstat, struct filestat *fst)
 	else {
 		strmode(vn.vn_mode, mode);
 	}
-	(void)printf(" %6ld %10s", vn.vn_fileid, mode);
+	(void)printf(" %6jd %10s", (intmax_t)vn.vn_fileid, mode);
 
 	if (vn.vn_type == PS_FST_VTYPE_VBLK || vn.vn_type == PS_FST_VTYPE_VCHR) {
 		if (nflg || !*vn.vn_devname)
@@ -461,7 +462,7 @@ print_vnode_info(struct procstat *procstat, struct filestat *fst)
 			printf(" %6s", vn.vn_devname);
 		}
 	} else
-		printf(" %6lu", vn.vn_size);
+		printf(" %6ju", (intmax_t)vn.vn_size);
 	print_access_flags(fst->fs_fflags);
 }