diff --git a/app/modules/rotary.c b/app/modules/rotary.c
index af60a4e3..cedb02fd 100644
--- a/app/modules/rotary.c
+++ b/app/modules/rotary.c
@@ -152,6 +152,8 @@ static int lrotary_setup( lua_State* L )
   DATA *d = data[id];
   memset(d, 0, sizeof(*d));
 
+  d->id = id;
+
   os_timer_setfn(&d->timer, lrotary_timer_done, (void *) d);
   
   int i;