--- a/src/os/unix/ngx_process_cycle.c
+++ b/src/os/unix/ngx_process_cycle.c
@@ -170,7 +170,7 @@ ngx_master_process_cycle(ngx_cycle_t *cy

         ngx_time_update(0, 0);

-        ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
+        ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
                        "wake up, sigio %i", sigio);

         if (ngx_reap) {