diff --git a/lib/thread.h b/lib/thread.h
index 978aa6b..69bb8d6 100644
--- a/lib/thread.h
+++ b/lib/thread.h
@@ -1,5 +1,6 @@
 /* Thread management routine header.
  * Copyright (C) 1998 Kunihiro Ishiguro
+ * Portions Copyright (c) 2008 Everton da Silva Marques <everton.marques@gmail.com>
  *
  * This file is part of GNU Zebra.
  *
@@ -137,6 +138,12 @@
       thread = thread_add_timer (master, func, arg, time); \
   } while (0)
 
+#define THREAD_TIMER_MSEC_ON(master,thread,func,arg,time) \
+  do { \
+    if (! thread) \
+      thread = thread_add_timer_msec (master, func, arg, time); \
+  } while (0)
+
 #define THREAD_OFF(thread) \
   do { \
     if (thread) \