diff --git a/src/tar.c b/src/tar.c
index 4d2c4b80..a5987dec 100644
--- a/src/tar.c
+++ b/src/tar.c
@@ -75,6 +75,8 @@ extern void diff_archive ();
 extern void create_archive ();
 extern void update_archive ();
 extern void junk_archive ();
+extern void init_volume_number ();
+extern void closeout_volume_number ();
 
 /* JF */
 extern time_t get_date ();