diff --git a/src/core/ngx_log.h b/src/core/ngx_log.h
index ab64a5ad0..78cea2a3b 100644
--- a/src/core/ngx_log.h
+++ b/src/core/ngx_log.h
@@ -70,6 +70,9 @@ struct ngx_log_s {
     char                *action;
 
     ngx_log_t           *next;
+
+    NGX_COMPAT_BEGIN(5)
+    NGX_COMPAT_END
 };