diff --git a/src/os/unix/ngx_process_cycle.c b/src/os/unix/ngx_process_cycle.c
index ec8368b..1b6a080 100644
--- a/src/os/unix/ngx_process_cycle.c
+++ b/src/os/unix/ngx_process_cycle.c
@@ -1027,6 +1027,12 @@
         return;
     }
 
+    if (ngx_event_flags & NGX_USE_EVENTPORT_EVENT) {
+        if (ngx_add_event(ev, NGX_READ_EVENT, 0) == NGX_ERROR) {
+            return;
+        }
+    }
+
     if (n == NGX_AGAIN) {
         return;
     }