diff --git a/internal.h b/internal.h
index b271413..7ae1297 100644
--- a/internal.h
+++ b/internal.h
@@ -140,6 +140,7 @@
 extern int tty_main(int argc, char** argv);
 extern int umount_main(int argc, char** argv);
 extern int uname_main(int argc, char** argv);
+extern int uptime_main(int argc, char** argv);
 extern int uniq_main(int argc, char** argv);
 extern int update_main(int argc, char** argv);
 extern int wc_main(int argc, char** argv);