diff --git a/src/proto/os_unix.pro b/src/proto/os_unix.pro
index 91024b1..268f3bf 100644
--- a/src/proto/os_unix.pro
+++ b/src/proto/os_unix.pro
@@ -88,4 +88,5 @@
 void xsmp_close(void);
 void stop_timeout(void);
 const int *start_timeout(long msec);
+void delete_timer(void);
 /* vim: set ft=c : */