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-rw-r--r--src/event/ngx_event_timer.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/event/ngx_event_timer.c b/src/event/ngx_event_timer.c
index 5e866a491..e002cb7eb 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;