diff --git a/include/libbb.h b/include/libbb.h
index 9529b56e0..accc08ddf 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -502,6 +502,7 @@ extern void print_login_issue(const char *issue_file, const char *tty);
 extern void print_login_prompt(void);
 
 #ifdef BB_NOMMU
+extern void vfork_daemon(int nochdir, int noclose);
 extern void vfork_daemon_rexec(int nochdir, int noclose,
 		int argc, char **argv, char *foreground_opt);
 #endif