diff --git a/src/http/ngx_http_upstream.h b/src/http/ngx_http_upstream.h
index f07df42cf..74d55ef1c 100644
--- a/src/http/ngx_http_upstream.h
+++ b/src/http/ngx_http_upstream.h
@@ -71,6 +71,9 @@ typedef struct {
     off_t                            bytes_sent;
 
     ngx_str_t                       *peer;
+
+    NGX_COMPAT_BEGIN(2)
+    NGX_COMPAT_END
 } ngx_http_upstream_state_t;
 
 
diff --git a/src/stream/ngx_stream_upstream.h b/src/stream/ngx_stream_upstream.h
index 89fff08c3..0e6aad623 100644
--- a/src/stream/ngx_stream_upstream.h
+++ b/src/stream/ngx_stream_upstream.h
@@ -101,6 +101,9 @@ typedef struct {
     off_t                              bytes_received;
 
     ngx_str_t                         *peer;
+
+    NGX_COMPAT_BEGIN(2)
+    NGX_COMPAT_END
 } ngx_stream_upstream_state_t;