nginx-0.0.2-2004-02-23-23:57:12 import
diff --git a/src/event/ngx_event_timer.c b/src/event/ngx_event_timer.c
index 5e866a4..e002cb7 100644
--- a/src/event/ngx_event_timer.c
+++ b/src/event/ngx_event_timer.c
@@ -9,6 +9,10 @@
  * protected by the single mutex
  */
 
+#if (NGX_THREADS)
+static ngx_mutex_t  *ngx_event_timer_mutex;
+#endif
+
 
 ngx_rbtree_t  *ngx_event_timer_rbtree;
 ngx_rbtree_t   ngx_event_timer_sentinel;