diff --git a/src/event/ngx_event_openssl_stapling.c b/src/event/ngx_event_openssl_stapling.c
index 03ff54043..60051ad47 100644
--- a/src/event/ngx_event_openssl_stapling.c
+++ b/src/event/ngx_event_openssl_stapling.c
@@ -245,6 +245,7 @@ ngx_ssl_stapling_file(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *file)
 
     staple->staple.data = buf;
     staple->staple.len = len;
+    staple->valid = NGX_MAX_TIME_T_VALUE;
 
     return NGX_OK;